Yes, neg is in the scrabble dictionary

...and is worth 6 points by itself.

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Neg Definition

abbreviation

Negative.
from the English-language Wiktionary
Negative.
from Free Scrabble Dictionary
Negotiable.
from Free Scrabble Dictionary

verb

To give negative feedback.
from the English-language Wiktionary

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Top Words by points

Points

eng

4

2 letter words with NEG

Points

en

2

ne

2

3 letter words with NEG

Points

eng

4

gen

4

neg

4

Found 5 words in 0.10485 seconds