Yes, aster is in the scrabble dictionary

...and is worth 5 points by itself.

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Aster Definition

noun

Any of various plants of the genus Aster in the composite family, having radiate flower heads with white, pink, or violet rays and a usually yellow disk.
from The American Heritage Dictionary of the English Language, 4th Edition
Biology A star-shaped structure formed in the cytoplasm of a cell and having raylike fibers that surround the centrosome during mitosis.
from The American Heritage Dictionary of the English Language, 4th Edition
The China aster.
from The American Heritage Dictionary of the English Language, 4th Edition
Any of various chiefly fall-blooming leafy-stemmed composite herbs ( and closely related genera) with often showy heads containing disk flowers or both disk and ray flowers.
from Free Scrabble Dictionary
A system of microtubules arranged radially about a centriole at either end of the mitotic or meiotic spindle.
from Free Scrabble Dictionary

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Top Words by points

Points

stare

5

2 letter words with ASTER

Points

ar

2

as

2

at

2

ta

2

te

2

ae

2

re

2

er

2

es

2

et

2

3 letter words with ASTER

Points

sat

3

ers

3

sae

3

tes

3

tea

3

tas

3

tar

3

ras

3

rat

3

res

3

ret

3

tae

3

eta

3

est

3

era

3

eat

3

ear

3

sea

3

ser

3

set

3

ats

3

ate

3

art

3

ars

3

are

3

4 letter words with ASTER

Points

seat

4

rase

4

sera

4

seta

4

star

4

tare

4

tars

4

tase

4

tear

4

teas

4

tsar

4

sate

4

ares

4

arts

4

ates

4

ears

4

east

4

eats

4

eras

4

erst

4

etas

4

rate

4

rats

4

rest

4

rets

4

sear

4

5 letter words with ASTER

Points

stare

5

aster

5

rates

5

resat

5

tares

5

tears

5

Found 67 words in 0.13636 seconds