Yes, lack is in the scrabble dictionary

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Lack Definition

noun

A particular deficiency or absence: Owing to a lack of supporters, the reforms did not succeed.
from The American Heritage Dictionary of the English Language, 4th Edition
Deficiency or absence: Lack of funding brought the project to a halt.
from The American Heritage Dictionary of the English Language, 4th Edition
The fact or state of being wanting or deficient .
from Free Scrabble Dictionary
Something that is or is needed.
from Free Scrabble Dictionary

verb-intransitive

To be in need of something: She does not lack for friends.
from The American Heritage Dictionary of the English Language, 4th Edition
To be missing or deficient: We suspected that he was lying, but proof was lacking.
from The American Heritage Dictionary of the English Language, 4th Edition

verb-transitive

To be without or in need of: lacked the strength to lift the box.
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To be short or have need of something .
from Free Scrabble Dictionary
To stand in need of suffer from the absence or deficiency of .
from Free Scrabble Dictionary
To be deficient or missing .
from Free Scrabble Dictionary

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Top Words by points

Points

calk

10

2 letter words with LACK

Points

al

2

ka

6

la

2

3 letter words with LACK

Points

ack

9

lac

5

4 letter words with LACK

Points

calk

10

lack

10

Found 7 words in 0.14565 seconds