flack vs flak

flack and flak both are nouns.

Word	Noun	Adjective	Verb	Adverb
flack	Yes	No	No	No
flak	Yes	No	No	No

As nouns, flack and flak are synonyms defined as:

Other synonyms of flack include ack-ack, ack-ack gun, antiaircraft, antiaircraft gun, pom-pom.

As nouns, flack and flak are synonyms defined as:

Other synonyms of flack include attack, blast, fire.

As nouns, flack and flak are synonyms defined as:

flack and flak: a slick spokesperson who can turn any criticism to the advantage of their employer

Other synonyms of flack include flack catcher, flak catcher.

flack (noun)	flak (noun)
artillery designed to shoot upward at airplanes	artillery designed to shoot upward at airplanes
intense adverse criticism	intense adverse criticism
a slick spokesperson who can turn any criticism to the advantage of their employer	a slick spokesperson who can turn any criticism to the advantage of their employer