facultative

1. Biology Capable of functioning under varying environmental conditions. Used of certain organisms, such as bacteria that can live with or without oxygen.

2. Capable of occurring or not occurring; contingent.

3. Granting permission or authority.

4. Not required or compulsory; optional.

5. Of or relating to a mental faculty.

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Here are some other words you could make with the letters facultative, you can also
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Top Words by points	Points	Word Game
facultative	19	Scrabble

2 Letters	Scrabble® Points
aa	2
ae	2
ai	2
al	2
at	2
ef	5
el	2
et	2
fa	5
fe	5
if	5
it	2
la	2
li	2
ta	2
te	2
ti	2
ut	2

3 Letters	Scrabble® Points
aal	3
ace	5
act	5
aft	6
ail	3
ait	3
ala	3
ale	3
alt	3
ate	3
att	3
ava	6
ave	6
caf	8
cat	5
cel	5
cue	5
cut	5
eat	3
eau	3
ecu	5
eft	6
elf	6
eta	3
fat	6
fet	6
feu	6
fie	6
fil	6
fit	6
flu	6
ice	5
lac	5
lat	3
lav	6
lea	3
lei	3
let	3
leu	3
lev	6
lie	3
lit	3
luv	6
tae	3
tat	3
tau	3
tav	6
tea	3
tec	5
tel	3
tet	3
tic	5
tie	3
til	3
tit	3
tui	3
tut	3
uta	3
ute	3
vac	8
vat	6
vau	6
vet	6
via	6
vie	6
fav	9

4 Letters	Scrabble® Points
acai	6
acta	6
alae	4
alec	6
alef	7
alfa	7
alif	7
alit	4
cafe	9
calf	9
cate	6
caul	6
cava	9
cave	9
ceil	6
celt	6
cite	6
clef	9
clue	6
cuif	9
cult	6
cute	6
etic	6
etui	4
evil	7
face	9
fact	9
fail	7
fate	7
fava	10
fave	10
feal	7
feat	7
felt	7
feta	7
fiat	7
fice	9
fila	7
file	7
five	10
flat	7
flea	7
flic	9
flit	7
flue	7
fuci	9
fuel	7
ilea	4
lace	6
laic	6
late	4
lati	4
latu	4
lava	7
lave	7
leaf	7
left	7
leva	7
lice	6
lief	7
lieu	4
life	7
lift	7
lite	4
litu	4
live	7
luce	6
lute	4
tace	6
tact	6
tael	4
tail	4
tala	4
talc	6
tale	4
tali	4
tate	4
taut	4
teal	4
teat	4
tela	4
tile	4
tilt	4
tufa	7
tuft	7
tule	4
ulva	7
uvea	7
vail	7
vale	7
vatu	7
veal	7
veil	7
vela	7
vial	7
vice	9
vile	7
vita	7
vlei	7

5 Letters	Scrabble® Points
aceta	7
acute	7
aecia	7
alate	5
alive	8
atilt	5
attic	7
aulic	7
avail	8
calif	10
calve	10
cavie	10
cavil	10
civet	10
clave	10
clavi	10
cleat	7
cleft	10
clift	10
culet	7
culti	7
cutie	7
eclat	7
evict	10
facet	10
facia	10
facta	10
fatal	8
fault	8
fauve	11
fecal	10
fetal	8
filet	8
flava	11
flite	8
flute	8
ileac	7
latte	5
lutea	5
tacet	7
tacit	7
tafia	8
tecta	7
telia	5
telic	7
tical	7
title	5
tuile	5
utile	5
uveal	8
vacua	10
valet	8
value	8
vatic	10
vault	8
vitae	8
vital	8
vitta	8

6 Letters	Scrabble® Points
acetal	8
active	11
actual	8
acuate	8
aculei	8
aecial	8
atavic	11
atelic	8
aviate	9
cattie	8
cattle	8
caveat	11
cutlet	8
cuttle	8
eluvia	9
faciae	11
facial	11
facile	11
facula	11
faecal	11
faucal	11
faucet	11
favela	12
fecial	11
fecula	11
fetial	9
flauta	9
futile	9
luetic	8
tectal	8
vacate	11
valuta	9
vatful	12
vittae	9
vittle	9

7 Letters	Scrabble® Points
actuate	9
cattail	9
cavetti	12
clavate	12
cuittle	9
factual	12
faculae	12
falcate	12
faucial	12
flattie	10
lactate	9
lattice	9
tactful	12
tactile	9
tactual	9
valuate	10
vatical	12
victual	12

8 Letters	Scrabble® Points
activate	13
califate	13
cavitate	13

9 Letters	Scrabble® Points
cavaletti	14
cultivate	14

11 Letters	Scrabble® Points
facultative	19