Yes, sustain is in the scrabble dictionary

...and is worth 9 points by itself.

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Sustain Definition

noun

A musical effect that prolongs a note's resonance .
from Free Scrabble Dictionary

verb-transitive

To experience or suffer: sustained a fatal injury.
from The American Heritage Dictionary of the English Language, 4th Edition
To keep in existence; maintain.
from The American Heritage Dictionary of the English Language, 4th Edition
To keep up (a joke or assumed role, for example) competently.
from The American Heritage Dictionary of the English Language, 4th Edition
To prove or corroborate; confirm.
from The American Heritage Dictionary of the English Language, 4th Edition
To supply with necessities or nourishment; provide for.
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To support by adequate proof .
from Free Scrabble Dictionary
To support as true, legal, or just.
from Free Scrabble Dictionary
To allow or admit as valid .
from Free Scrabble Dictionary
To bear up under.
from Free Scrabble Dictionary
To buoy up .
from Free Scrabble Dictionary

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Wildcard(?) letters appear in RED

Here are some other words you could make with the letters SUSTAIN, you can also
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Top Words by points

Points

issuant

7

2 letter words with SUSTAIN

Points

ai

2

an

2

as

2

at

2

in

2

is

2

it

2

na

2

nu

2

si

2

ta

2

ti

2

un

2

us

2

ut

2

3 letter words with SUSTAIN

Points

ain

3

ais

3

ait

3

ani

3

ant

3

ass

3

ats

3

ins

3

its

3

nit

3

nus

3

nut

3

san

3

sat

3

sau

3

sin

3

sis

3

sit

3

sun

3

sus

3

tan

3

tas

3

tau

3

tin

3

tis

3

tui

3

tun

3

uni

3

uns

3

uta

3

uts

3

4 letter words with SUSTAIN

Points

ains

4

aits

4

anis

4

anti

4

ants

4

anus

4

aunt

4

nits

4

nuts

4

sain

4

sans

4

sati

4

sins

4

sits

4

snit

4

stan

4

stun

4

suit

4

suns

4

tain

4

tans

4

tass

4

taus

4

tian

4

tins

4

tuis

4

tuna

4

tuns

4

unai

4

unis

4

unit

4

utas

4

5 letter words with SUSTAIN

Points

antis

5

aunts

5

nisus

5

sains

5

saint

5

sasin

5

satin

5

satis

5

sinus

5

situs

5

snits

5

stain

5

stans

5

stuns

5

suint

5

suits

5

tains

5

tians

5

tunas

5

unais

5

units

5

6 letter words with SUSTAIN

Points

saints

6

satins

6

stains

6

suints

6

7 letter words with SUSTAIN

Points

issuant

7

sustain

7

Found 105 words in 0.23301 seconds