Yes, aff is in the scrabble dictionary

...and is worth 9 points by itself.

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Aff Definition

Off.
from The Century Dictionary and Cyclopedia

abbreviation

Affirmative.
from Free Scrabble Dictionary

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Top Words by points

Points

aff

9

2 letter words with AFF

Points

fa

5

3 letter words with AFF

Points

aff

9

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