Is “Lack” a Scrabble word?
Yes
LACK
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Lack
/lak/
noun
1.A defect or failing; moral or spiritual degeneracy.
2.A deficiency or need (of something desirable or necessary); an absence, want.
verb
1.To be without, to need, to require.
“My life lacks excitement.”
2.To be short (of or for something).
“He'll never lack for company while he's got all that money.”
3.To be in want.