flak catcher vs spokesperson

flak catcher and spokesperson both are nouns.

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

As nouns, spokesperson is a hypernym of flak catcher; that is, spokesperson is a word with a broader meaning than flak catcher:

flak catcher: a slick spokesperson who can turn any criticism to the advantage of their employer
spokesperson: an advocate who represents someone else's policy or purpose

Other hypernyms of flak catcher include interpreter, representative, voice.

flak catcher (noun)	spokesperson (noun)
a slick spokesperson who can turn any criticism to the advantage of their employer	an advocate who represents someone else's policy or purpose