flak vs flack

flak and flack both are nouns.

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

As nouns, flak and flack are synonyms defined as:

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

As nouns, flak and flack are synonyms defined as:

Other synonyms of flak include attack, blast, fire.

As nouns, flak and flack are synonyms defined as:

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

Other synonyms of flak include flack catcher, flak catcher.

flak (noun)	flack (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