flack vs flak catcher

flack and flak catcher both are nouns.

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

As nouns, flack and flak catcher are synonyms defined as:

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

Other synonyms of flack include flack catcher, flak.

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