respiration

1. Any of various analogous metabolic processes by which certain organisms, such as fungi and anaerobic bacteria, obtain energy from organic molecules.

2. The act or process by which an organism without lungs, such as a fish or plant, exchanges gases with its environment.

3. The act or process of inhaling and exhaling; breathing. Also called ventilation.

4. The oxidative process occurring within living cells by which the chemical energy of organic molecules is released in a series of metabolic steps involving the consumption of oxygen and the liberation of carbon dioxide and water.

5. The placing of air or dissolved gases in intimate contact with the circulating medium of a multicellular organism (as by breathing).

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Here are some other words you could make with the letters respiration, you can also
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Top Words by points	Points	Word Game
respiration	13	Scrabble

2 Letters	Scrabble® Points
ae	2
ai	2
an	2
ar	2
as	2
at	2
en	2
er	2
es	2
et	2
in	2
is	2
it	2
na	2
ne	2
no	2
oe	2
oi	2
on	2
op	4
or	2
os	2
pa	4
pe	4
pi	4
po	4
re	2
si	2
so	2
ta	2
te	2
ti	2
to	2

3 Letters	Scrabble® Points
ain	3
air	3
ais	3
ait	3
ane	3
ani	3
ant	3
ape	5
apo	5
apt	5
are	3
ars	3
art	3
asp	5
ate	3
ear	3
eat	3
ens	3
eon	3
era	3
ern	3
err	3
ers	3
est	3
eta	3
ins	3
ion	3
ire	3
its	3
nae	3
nap	5
net	3
nip	5
nit	3
nor	3
nos	3
not	3
oar	3
oat	3
oes	3
one	3
ons	3
opa	5
ope	5
ops	5
opt	5
ora	3
ore	3
ors	3
ort	3
ose	3
pan	5
par	5
pas	5
pat	5
pea	5
pen	5
per	5
pes	5
pet	5
pia	5
pie	5
pin	5
pis	5
pit	5
poi	5
pos	5
pot	5
pro	5
psi	5
pst	5
rai	3
ran	3
rap	5
ras	3
rat	3
rei	3
rep	5
res	3
ret	3
ria	3
rin	3
rip	5
roe	3
rot	3
sae	3
san	3
sap	5
sat	3
sea	3
sei	3
sen	3
ser	3
set	3
sin	3
sip	5
sir	3
sit	3
son	3
sop	5
sot	3
spa	5
sri	3
tae	3
tan	3
tao	3
tap	5
tar	3
tas	3
tea	3
ten	3
tes	3
tie	3
tin	3
tip	5
tis	3
toe	3
ton	3
top	5
tor	3
aro	3
ats	3

4 Letters	Scrabble® Points
aeon	4
aero	4
ains	4
airn	4
airs	4
airt	4
aits	4
anes	4
anis	4
ante	4
anti	4
ants	4
aper	6
apes	6
apos	6
apse	6
ares	4
arts	4
ates	4
atop	6
earn	4
ears	4
east	4
eats	4
eons	4
epos	6
eras	4
erns	4
eros	4
errs	4
erst	4
etas	4
etna	4
inia	4
inro	4
inti	4
into	4
ions	4
iota	4
ires	4
iris	4
iron	4
naes	4
naoi	4
naos	4
nape	6
naps	6
neap	6
near	4
neat	4
nest	4
nets	4
nipa	6
nips	6
nisi	4
nite	4
nits	4
noes	4
noir	4
nope	6
nori	4
nose	4
nota	4
note	4
oars	4
oast	4
oats	4
ones	4
opas	6
open	6
opes	6
opts	6
ores	4
orra	4
orts	4
osar	4
pain	6
pair	6
pane	6
pans	6
pant	6
pare	6
parr	6
pars	6
part	6
pase	6
past	6
pate	6
pats	6
pean	6
pear	6
peas	6
peat	6
pein	6
pens	6
pent	6
peon	6
peri	6
pert	6
peso	6
pest	6
pets	6
pian	6
pias	6
pier	6
pies	6
pina	6
pine	6
pins	6
pint	6
pion	6
pirn	6
piso	6
pita	6
pits	6
poet	6
pois	6
pone	6
pons	6
pore	6
porn	6
port	6
pose	6
post	6
pots	6
prao	6
prat	6
proa	6
pros	6
rain	4
rais	4
rani	4
rant	4
rape	6
raps	6
rapt	6
rare	4
rase	4
rasp	6
rate	4
rato	4
rats	4
reap	6
rear	4
rein	4
reis	4
reno	4
rent	4
repo	6
reps	6
rest	4
rets	4
rias	4
rins	4
riot	4
ripe	6
rips	6
rise	4
rite	4
roan	4
roar	4
roes	4
rope	6
rose	4
rota	4
rote	4
roti	4
rots	4
sain	4
sane	4
sari	4
sate	4
sati	4
sear	4
seat	4
sent	4
sept	6
sera	4
seta	4
sine	4
sipe	6
sire	4
site	4
snap	6
snip	6
snit	4
snot	4
soap	6
soar	4
sone	4
sora	4
sore	4
sori	4
sorn	4
sort	4
spae	6
span	6
spar	6
spat	6
spin	6
spit	6
spot	6
star	4
step	6
stir	4
stoa	4
stop	6
tain	4
tans	4
taos	4
tape	6
taps	6
tare	4
tarn	4
taro	4
tarp	6
tars	4
tase	4
tear	4
teas	4
tein	4
tens	4
tepa	6
tern	4
tian	4
tier	4
ties	4
tine	4
tins	4
tipi	6
tips	6
tire	4
tiro	4
toea	4
toes	4
tone	4
tons	4
tope	6
topi	6
tops	6
tora	4
tore	4
tori	4
torn	4
torr	4
tors	4
tosa	4
trap	6
trio	4
trip	6
trop	6
tsar	4
nare	4
arie	4
aros	4
stan	4

5 Letters	Scrabble® Points
aeons	5
airer	5
airns	5
airts	5
anise	5
antes	5
antis	5
antre	5
apers	7
aport	7
apres	7
apron	7
apter	7
arise	5
arose	5
arpen	7
arris	5
arson	5
aspen	7
asper	7
aster	5
astir	5
atone	5
atrip	7
earns	5
entia	5
eosin	5
estop	7
etnas	5
inapt	7
inept	7
inert	5
inset	5
inter	5
intis	5
intro	5
iotas	5
irate	5
irone	5
irons	5
napes	7
nares	5
naris	5
nates	5
neaps	7
nears	5
neats	5
neist	5
nerts	5
netop	7
nipas	7
nisei	5
niter	5
nites	5
nitre	5
nitro	5
noirs	5
noise	5
noria	5
noris	5
noter	5
notes	5
oaten	5
oater	5
onset	5
opens	7
opera	7
opine	7
opsin	7
orate	5
ornis	5
orpin	7
orris	5
osier	5
ostia	5
paeon	7
pains	7
paint	7
pairs	7
paise	7
panes	7
panto	7
pants	7
paren	7
pareo	7
parer	7
pares	7
paris	7
parrs	7
parse	7
parts	7
paseo	7
paste	7
paten	7
pater	7
pates	7
patin	7
patio	7
peans	7
pears	7
peart	7
peats	7
peins	7
penis	7
peons	7
peris	7
pesto	7
piani	7
piano	7
pians	7
piers	7
pieta	7
pinas	7
pines	7
pinot	7
pinta	7
pinto	7
pints	7
pions	7
pirns	7
piste	7
pitas	7
piton	7
poets	7
point	7
poise	7
pones	7
pores	7
porin	7
porns	7
ports	7
poser	7
posit	7
praos	7
prase	7
prate	7
prats	7
presa	7
prest	7
prier	7
pries	7
print	7
prion	7
prior	7
prise	7
proas	7
prone	7
prose	7
prost	7
psoae	7
psoai	7
rains	5
raise	5
ranis	5
rants	5
raper	7
rapes	7
rares	5
raser	5
rater	5
rates	5
ratio	5
ratos	5
reais	5
reaps	7
rears	5
reins	5
renos	5
rents	5
repin	7
repos	7
repot	7
repro	7
reran	5
resat	5
resin	5
resit	5
retia	5
retro	5
riant	5
rinse	5
riots	5
ripen	7
riper	7
ripes	7
risen	5
riser	5
rites	5
roans	5
roars	5
roast	5
roper	7
ropes	7
roset	5
rosin	5
rosti	5
rotas	5
rotes	5
rotis	5
saint	5
saner	5
santo	5
sapor	7
sarin	5
satin	5
senor	5
senti	5
sepia	7
septa	7
serai	5
serin	5
seton	5
siren	5
sirra	5
sitar	5
snare	5
sneap	7
snipe	7
snore	5
snort	5
sonar	5
sorer	5
spait	7
spare	7
spate	7
spean	7
spear	7
speir	7
spent	7
spier	7
spine	7
spire	7
spirt	7
spite	7
spore	7
sport	7
sprat	7
sprit	7
stain	5
stair	5
stane	5
stare	5
stein	5
steno	5
stern	5
stipe	7
stirp	7
stoae	5
stoai	5
stone	5
stope	7
store	5
strap	7
strep	7
stria	5
strip	7
strop	7
tains	5
taper	7
tapes	7
tapir	7
tapis	7
tares	5
tarns	5
taros	5
tarps	7
tarre	5
tarsi	5
tears	5
teins	5
tenia	5
tenor	5
tepas	7
terai	5
terns	5
terra	5
tians	5
tiers	5
tinea	5
tines	5
tipis	7
tires	5
tiros	5
toeas	5
toner	5
tones	5
toper	7
topes	7
topis	7
toras	5
tores	5
torii	5
torrs	5
torse	5
torsi	5
train	5
trans	5
traps	7
trier	5
tries	5
trine	5
trios	5
tripe	7
trips	7
trois	5
trona	5
trone	5
trope	7
inspo	7

6 Letters	Scrabble® Points
airers	6
airest	6
airier	6
antres	6
aorist	6
aprons	8
ariose	6
ariosi	6
arisen	6
aristo	6
aroint	6
arpens	8
arpent	8
arrest	6
arseno	6
arsine	6
arsino	6
artier	6
artsie	6
aspire	8
astern	6
atoner	6
atones	6
enrapt	8
entrap	8
errant	6
espoir	8
esprit	8
estrin	6
inerts	6
insert	6
instar	6
instep	8
inters	6
intros	6
ionise	6
irater	6
ironer	6
irones	6
isatin	6
nestor	6
netops	8
niters	6
nitres	6
nitros	6
norias	6
norite	6
nosier	6
noters	6
oaters	6
oatier	6
operas	8
opiate	8
opines	8
orates	6
orient	6
ornate	6
orpine	8
orpins	8
osetra	6
paeons	8
paints	8
panier	8
pantie	8
pantos	8
parens	8
parent	8
pareos	8
parers	8
paries	8
parrot	8
parser	8
parson	8
parter	8
parton	8
paster	8
pastie	8
pastor	8
patens	8
paters	8
patine	8
patins	8
patios	8
patois	8
patron	8
periti	8
pernio	8
perron	8
person	8
petsai	8
pianos	8
pietas	8
pineta	8
pinier	8
pinite	8
pinots	8
pintas	8
pintos	8
pirate	8
piston	8
pitier	8
pities	8
pitons	8
pointe	8
points	8
poiser	8
ponies	8
pontes	8
porins	8
porter	8
posier	8
poster	8
postie	8
postin	8
potsie	8
praise	8
prater	8
prates	8
pratie	8
presto	8
pretor	8
priers	8
priest	8
prints	8
prions	8
priors	8
prison	8
proser	8
prosit	8
protea	8
protei	8
pterin	8
ptisan	8
raiser	6
raisin	6
ranter	6
rapers	8
rapier	8
rapine	8
rapini	8
rapist	8
raptor	8
rarest	6
rasper	8
raster	6
raters	6
ratine	6
ration	6
ratios	6
reason	6
repair	8
repast	8
repins	8
report	8
repots	8
repros	8
resort	6
respot	8
retain	6
retina	6
retorn	6
retros	6
rinser	6
rioter	6
ripens	8
ripest	8
ripost	8
ristra	6
ropers	8
ropier	8
rosier	6
roster	6
rostra	6
rotini	6
santir	6
sapote	8
sarnie	6
sartor	6
satire	6
satori	6
seitan	6
senior	6
seniti	6
senora	6
sierra	6
sinter	6
sitrep	8
snarer	6
sniper	8
snorer	6
soaper	8
soarer	6
sopite	8
sorner	6
sorter	6
sortie	6
sparer	8
spinet	8
spinor	8
spinto	8
spirea	8
spirit	8
sprain	8
sprent	8
sprier	8
sprint	8
sprite	8
starer	6
sterna	6
stoner	6
stoper	8
storer	6
strain	6
striae	6
strine	6
stripe	8
tapers	8
tapirs	8
tarpon	8
tarres	6
tenias	6
tenors	6
tensor	6
teopan	8
terais	6
terras	6
tiepin	8
tineas	6
tinier	6
tisane	6
toners	6
tonier	6
topers	8
tories	6
trains	6
trapes	8
trepan	8
triens	6
triers	6
trines	6
triose	6
tripes	8
tripos	8
tronas	6
trones	6
tropes	8
tropin	8
prones	8
repost	8

7 Letters	Scrabble® Points
airiest	7
airport	9
airpost	9
anestri	7
antsier	7
aroints	7
arpents	9
artsier	7
aspirer	9
aspirin	9
atoners	7
atonies	7
atopies	9
atropin	9
entraps	9
epinaoi	9
epinaos	9
erasion	7
errants	7
esparto	9
inertia	7
inosite	7
inspire	9
ioniser	7
ironers	7
ironies	7
ironise	7
ironist	7
isatine	7
nastier	7
noisier	7
norites	7
oestrin	7
operant	9
opiates	9
orients	7
orpines	9
painter	9
paniers	9
panties	9
parents	9
parries	9
parrots	9
parters	9
partier	9
parties	9
partner	9
partons	9
pastern	9
pastier	9
patines	9
patrons	9
perrons	9
persona	9
pertain	9
pianist	9
piaster	9
piastre	9
pierrot	9
piniest	9
pinites	9
pintoes	9
pirates	9
pitiers	9
pointer	9
pointes	9
pornier	9
porters	9
postern	9
praetor	9
prairie	9
praiser	9
praters	9
praties	9
preriot	9
presort	9
pretors	9
printer	9
pronate	9
prorate	9
prosier	9
prostie	9
protean	9
proteas	9
protein	9
pterins	9
rainier	7
ranters	7
rapiers	9
rapines	9
raptors	9
raspier	9
ratines	7
rations	7
repaint	9
repairs	9
repoint	9
reports	9
reposit	9
reprint	9
retains	7
retinas	7
retrain	7
retsina	7
rioters	7
ripieno	9
riposte	9
roaster	7
roister	7
ropiest	9
rotinis	7
santero	7
sapient	9
seaport	9
senarii	7
senator	7
senopia	9
serrano	7
sierran	7
sinopia	9
sinopie	9
snorter	7
soapier	9
soprani	9
spinate	9
spinier	9
spirant	9
spirier	9
sporran	9
sporter	9
stainer	7
stearin	7
stonier	7
striper	9
tarpons	9
tarries	7
tarsier	7
teopans	9
terrain	7
tiepins	9
tipsier	9
trainer	7
traipse	9
treason	7
trepans	9
tropine	9
tropins	9

8 Letters	Scrabble® Points
airports	10
airstrip	10
anterior	8
antrorse	8
atropine	10
atropins	10
inertias	8
inspirer	10
interior	8
introrse	8
notaries	8
notarise	8
operants	10
painters	10
paintier	10
pantries	10
parities	10
partiers	10
partners	10
pertains	10
pierrots	10
pinaster	10
pointers	10
pointier	10
porniest	10
praetors	10
prairies	10
pretrain	10
printers	10
priorate	10
priories	10
prisoner	10
pristane	10
pristine	10
pronates	10
prorates	10
proteans	10
proteins	10
rainiest	8
rarities	8
repaints	10
repoints	10
reprints	10
restrain	8
retrains	8
ripienos	10
rotaries	8
saponite	10
sartorii	8
senorita	8
septoria	10
sportier	10
sprinter	10
strainer	8
stripier	10
terrains	8
terrapin	10
trainers	8
tropines	10

9 Letters	Scrabble® Points
atropines	11
interiors	9
patronise	11
pretorian	11
pretrains	11
priorates	11
serration	9
terrapins	11
topiaries	11
transpire	11

10 Letters	Scrabble® Points
inspirator	12
pretorians	12

11 Letters	Scrabble® Points
respiration	13