one-upmanship

1. Informal the art of outdoing or showing up a rival or competitor, as in exploits, privileges, or honors.

2. The art or practice of successively outdoing a competitor.

3. A succession of instances of outdoing a competitor.

4. The attitude or practice of trying to keep one step ahead of a friend or competitor; vigorous competitiveness.

5. The practice of keeping one jump ahead of a friend or competitor.

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Here are some other words you could make with the letters one-upmanship

Top Words by points	Points	Word Game
penmanship	19	Scrabble

2 Letters	Scrabble® Points
ae	2
ah	5
ai	2
am	4
an	2
as	2
eh	5
em	4
en	2
es	2
ha	5
he	5
hi	5
hm	7
ho	5
in	2
is	2
ma	4
me	4
mi	4
mo	4
mu	4
na	2
ne	2
no	2
nu	2
oe	2
oh	5
oi	2
om	4
on	2
op	4
os	2
pa	4
pe	4
pi	4
po	4
sh	5
si	2
so	2
uh	5
um	4
un	2
up	4
us	2

3 Letters	Scrabble® Points
ahi	6
ahs	6
aim	5
ain	3
ais	3
ami	5
amp	7
amu	5
ane	3
ani	3
ape	5
apo	5
app	7
ash	6
asp	5
eau	3
emo	5
ems	5
emu	5
ens	3
eon	3
hae	6
ham	8
hao	6
hap	8
has	6
hem	8
hen	6
hep	8
hes	6
hie	6
him	8
hin	6
hip	8
his	6
hoe	6
hom	8
hon	6
hop	8
hue	6
hum	8
hun	6
hup	8
imp	7
inn	3
ins	3
ion	3
ism	5
mae	5
man	5
map	7
mas	5
meh	8
men	5
mho	8
mis	5
moa	5
moi	5
mon	5
mop	7
mos	5
mun	5
mus	5
nae	3
nah	6
nam	5
nan	3
nap	5
nim	5
nip	5
noh	6
nom	5
nos	3
nun	3
nus	3
oes	3
ohm	8
ohs	6
oma	5
oms	5
one	3
ons	3
opa	5
ope	5
ops	5
ose	3
pah	8
pam	7
pan	5
pap	7
pas	5
pea	5
peh	8
pen	5
pep	7
pes	5
phi	8
pho	8
pia	5
pie	5
pin	5
pip	7
pis	5
piu	5
poh	8
poi	5
pom	7
pop	7
pos	5
psi	5
pun	5
pup	7
pus	5
sae	3
san	3
sap	5
sau	3
sea	3
sei	3
sen	3
sha	6
she	6
sho	6
sim	5
sin	3
sip	5
soh	6
som	5
son	3
sop	5
sou	3
spa	5
sue	3
sum	5
sun	3
sup	5
ump	7
ums	5
uni	3
uns	3
upo	5
ups	5
use	3

4 Letters	Scrabble® Points
aeon	4
ahem	9
ahis	7
aims	6
ains	4
amen	6
amie	6
amin	6
amis	6
amps	8
amus	6
anes	4
anis	4
anon	4
anus	4
apes	6
apos	6
apps	8
apse	6
emos	6
emus	6
eons	4
epha	9
epos	6
haem	9
haen	7
haes	7
hame	9
hams	9
haps	9
hasp	9
heap	9
hemp	11
hems	9
hens	7
heps	9
hies	7
hims	9
hins	7
hips	9
hisn	7
hoes	7
homa	9
home	9
homs	9
hone	7
hons	7
hope	9
hops	9
hose	7
hues	7
hump	11
hums	9
huns	7
imps	8
inns	4
ions	4
maes	6
main	6
mane	6
mano	6
mans	6
maps	8
mash	9
maun	6
mean	6
meno	6
menu	6
meou	6
mesa	6
mesh	9
mhos	9
mien	6
mina	6
mine	6
mise	6
miso	6
moan	6
moas	6
mons	6
mope	8
mops	8
mosh	9
moue	6
muni	6
muns	6
muon	6
muse	6
mush	9
muso	6
naes	4
name	6
nano	4
nans	4
naoi	4
naos	4
nape	6
naps	6
neap	6
nema	6
neon	4
neum	6
nims	6
nine	4
nipa	6
nips	6
noes	4
noma	6
nome	6
noms	6
nona	4
none	4
noni	4
nope	6
nose	4
nosh	7
noun	4
nous	4
nuns	4
ohia	7
ohms	9
omas	6
omen	6
ones	4
onus	4
opah	9
opas	6
open	6
opes	6
opus	6
ouph	9
pain	6
pams	8
pane	6
pans	6
paps	8
pase	6
pash	9
pean	6
peas	6
pehs	9
pein	6
pens	6
peon	6
pepo	8
peps	8
peso	6
phis	9
phon	9
phos	9
pian	6
pias	6
pies	6
pima	8
pimp	10
pina	6
pine	6
pins	6
pion	6
pipa	8
pipe	8
pips	8
pish	9
piso	6
poem	8
pois	6
pome	8
pomp	10
poms	8
pone	6
pons	6
pope	8
pops	8
pose	6
posh	9
puma	8
pump	10
puna	6
puns	6
pupa	8
pups	8
push	9
sain	4
same	6
samp	8
sane	4
seam	6
semi	6
sham	9
shea	7
shen	7
shim	9
shin	7
ship	9
shmo	9
shoe	7
shop	9
shun	7
sima	6
simp	8
sine	4
sinh	7
sipe	6
snap	6
snip	6
soap	6
soma	6
some	6
sone	4
soph	9
soup	6
spae	6
spam	8
span	6
spin	6
spue	6
spun	6
sumi	6
sumo	6
sump	8
sunn	4
supe	6
umph	11
umps	8
unai	4
unis	4
upas	6
upon	6
pheo	9

5 Letters	Scrabble® Points
aeons	5
amens	7
amies	7
amine	7
amino	7
amins	7
amnio	7
amuse	7
anime	7
anion	5
anise	5
aphis	10
apish	10
ashen	8
aspen	7
ennui	5
eosin	5
ephas	10
haems	10
hames	10
hanse	8
happi	12
heaps	10
hemin	10
hemps	12
henna	8
hippo	12
hoise	8
homas	10
homes	10
homie	10
honan	8
hones	8
hopes	10
hosen	8
house	8
human	10
humps	12
inane	5
mahoe	10
mains	7
manes	7
manos	7
manse	7
manus	7
mason	7
means	7
mensa	7
mensh	10
menus	7
meous	7
meson	7
miaou	7
miens	7
minae	7
minas	7
mines	7
minus	7
moans	7
monas	7
monie	7
mopes	9
moues	7
mouse	7
munis	7
muons	7
names	7
nanos	5
napes	7
nappe	9
neaps	7
nemas	7
neons	5
neums	7
nines	5
nipas	7
noise	5
nomas	7
nomen	7
nomes	7
nonas	5
nones	5
nonis	5
nouns	5
numen	7
ohias	8
omens	7
onium	7
opahs	10
opens	7
opine	7
opium	9
opsin	7
ouphe	10
ouphs	10
paeon	7
pains	7
paise	7
panes	7
panne	7
paseo	7
pashm	12
pause	7
peans	7
peins	7
penis	7
penna	7
penni	7
peons	7
pepos	9
phase	10
phone	10
phons	10
piano	7
pians	7
pimas	9
pimps	11
pinas	7
pines	7
pinna	7
pinon	7
pinup	9
pions	7
pious	7
pipas	9
pipes	9
poems	9
poise	7
pomes	9
pomps	11
pones	7
popes	9
psoae	7
psoai	7
pumas	9
pumps	11
punas	7
pupae	9
pupas	9
senna	5
sepia	7
shame	10
shape	10
shine	8
shmoe	10
shone	8
sneap	7
snipe	7
soman	7
spahi	10
spean	7
spine	7
spume	9
sunna	5
umphs	12
unais	5
unhip	10
union	5
unman	7
unpen	7
unpin	7
usnea	5
inspo	7
pheos	10

6 Letters	Scrabble® Points
amines	8
aminos	8
amnion	8
amnios	8
animes	8
animus	8
anions	6
anomie	8
appose	10
ashine	9
ashmen	11
ennuis	6
eonian	6
eonism	8
haemin	11
hansom	11
happen	13
happis	13
hausen	9
hemins	11
hennas	9
hippos	13
homies	11
honans	9
humane	11
humans	11
impone	10
impose	10
inanes	6
inhume	11
inmesh	11
insane	6
inseam	8
inspan	8
mahoes	11
mashie	11
mesian	8
miaous	8
mishap	13
mispen	10
monies	8
monish	11
mopish	13
nanism	8
nappes	10
nappie	10
nasion	6
nomina	8
nonuse	6
numina	8
numnah	11
opines	8
opiums	10
ouphes	11
paeons	8
panino	8
pannes	8
penman	10
pennia	8
pennis	8
pepino	10
pepsin	10
phenom	13
phones	11
pianos	8
pinnae	8
pinnas	8
pinons	8
pinups	10
pneuma	10
poisha	11
ponies	8
popsie	10
puisne	8
punish	11
sannop	8
sannup	8
semina	8
shapen	11
shenai	9
shoppe	13
shumai	11
sienna	6
siphon	11
sunnah	9
supine	8
unhasp	11
unions	6
unison	6
unmans	8
unmesh	11
unopen	8
unpens	8
unpins	8
unseam	8
unship	11
unsnap	8
upheap	13
uppish	13

7 Letters	Scrabble® Points
amnions	9
anomies	9
epinaos	9
haemins	12
happens	14
heinous	10
homines	12
humpies	14
impones	11
inhuman	12
inhumes	12
inphase	12
mannish	12
mannose	9
mansion	9
nappies	11
noumena	9
numnahs	12
onanism	9
pension	9
peonism	11
pepinos	11
phenoms	14
phonies	12
pinesap	11
pinones	9
pneumas	11
pushpin	14
saponin	9
senopia	9
shapeup	14
shipman	14
shipmen	14
shippen	14
shippon	14
shopman	14
shopmen	14
spumone	11
spumoni	11
upheaps	14

8 Letters	Scrabble® Points
aphonies	13
eohippus	15
homespun	15
houseman	13
humanise	13
inhumane	13
peponium	14
saponine	10
unhappen	15
unshapen	13

9 Letters	Scrabble® Points
peponiums	15
pneumonia	13
unhappens	16
upmanship	18

10 Letters	Scrabble® Points
epiphanous	17
penmanship	19
pneumonias	14