Yes, booster is in the scrabble dictionary

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Booster Definition

noun

A booster shot.
from The American Heritage Dictionary of the English Language, 4th Edition
A device for increasing power or effectiveness.
from The American Heritage Dictionary of the English Language, 4th Edition
An enthusiastic promoter, as of a sports team or school.
from The American Heritage Dictionary of the English Language, 4th Edition
Electronics A radio-frequency amplifier.
from The American Heritage Dictionary of the English Language, 4th Edition
One that boosts, as:.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

booster

9

2 letter words with BOOSTER

Points

be

4

bo

4

er

2

es

2

et

2

oe

2

or

2

os

2

re

2

so

2

te

2

to

2

3 letter words with BOOSTER

Points

bes

5

bet

5

boo

5

bos

5

bot

5

bro

5

ers

3

est

3

obe

5

oes

3

oot

3

orb

5

ore

3

ors

3

ort

3

ose

3

reb

5

res

3

ret

3

rob

5

roe

3

roo

3

rot

3

ser

3

set

3

sob

5

sot

3

tes

3

toe

3

too

3

tor

3

4 letter words with BOOSTER

Points

best

6

bets

6

boor

6

boos

6

boot

6

bore

6

bort

6

bots

6

broo

6

bros

6

eros

4

erst

4

obes

6

oboe

6

oots

4

orbs

6

ores

4

orts

4

rebs

6

rest

4

rets

4

robe

6

robs

6

roes

4

roos

4

root

4

rose

4

rote

4

roto

4

rots

4

soot

4

sorb

6

sore

4

sort

4

stob

6

toes

4

tore

4

toro

4

tors

4

5 letter words with BOOSTER

Points

besot

7

boors

7

boost

7

boots

7

bores

7

borts

7

broos

7

brose

7

oboes

7

robes

7

robot

7

roose

5

roost

5

roots

5

roset

5

rotes

5

rotos

5

sober

7

store

5

tores

5

toros

5

torse

5

torso

5

6 letter words with BOOSTER

Points

reboot

8

robots

8

sorbet

8

strobe

8

torose

6

7 letter words with BOOSTER

Points

booster

9

reboots

9

Found 112 words in 0.24238 seconds