Is “Flak” a Scrabble word?
Yes
FLAK
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 Flak
/flæk/
noun
1.Ground-based anti-aircraft guns firing explosive shells.
2.Anti-aircraft shell fire.
3.Adverse criticism.
Synonyms: AAA, ack-ack, triple-A, ack-ack