Yes, erst is in the scrabble dictionary

...and is worth 4 points by itself.

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Erst Definition

adverb

Archaic Erstwhile.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

erst

4

2 letter words with ERST

Points

er

2

es

2

et

2

re

2

te

2

3 letter words with ERST

Points

ers

3

est

3

res

3

ret

3

ser

3

set

3

tes

3

4 letter words with ERST

Points

erst

4

rest

4

rets

4

Found 15 words in 0.11608 seconds