flak catcher vs interpreter

flak catcher and interpreter both are nouns.

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

As nouns, interpreter is a hypernym of flak catcher; that is, interpreter 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
interpreter: an advocate who represents someone else's policy or purpose

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

flak catcher (noun)	interpreter (noun)
a slick spokesperson who can turn any criticism to the advantage of their employer	(computer science) a program that translates and executes source language statements one line at a time
	an advocate who represents someone else's policy or purpose
	someone who mediates between speakers of different languages
	someone who uses art to represent something