Yes, yack is in the scrabble dictionary

...and is worth 13 points by itself.

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Yack Definition

verb

Slang Variant of yak2.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

caky

13

2 letter words with YACK

Points

ay

5

ka

6

ya

5

3 letter words with YACK

Points

ack

9

cay

8

kay

10

yak

10

4 letter words with YACK

Points

caky

13

yack

13

Found 9 words in 0.10684 seconds