Yes, lab is in the scrabble dictionary

...and is worth 7 points by itself.

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Lab Definition

noun

A laboratory.
from The American Heritage Dictionary of the English Language, 4th Edition

abbreviation

Labrador.
from Free Scrabble Dictionary

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Top Words by points

Points

alb

5

2 letter words with LAB

Points

ab

4

al

2

ba

4

la

2

3 letter words with LAB

Points

alb

5

bal

5

lab

5

Found 7 words in 0.11379 seconds