flack vs spokesperson

flack and spokesperson both are nouns.

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

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

flack: 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 flack include interpreter, representative, voice.

flack (noun)	spokesperson (noun)
artillery designed to shoot upward at airplanes	an advocate who represents someone else's policy or purpose
intense adverse criticism
a slick spokesperson who can turn any criticism to the advantage of their employer