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 0.1403 seconds