fuse indicator regulator vs flak

fuse indicator regulator and flak both are nouns.

Word	Noun	Adjective	Verb	Adverb
fuse indicator regulator	Yes	No	No	No
flak	Yes	No	No	No

fuse indicator regulator (noun)	flak (noun)
an instrument which sets the fuze time on projectiles with mechanical time fuzes.	artillery designed to shoot upward at airplanes
	intense adverse criticism
	a slick spokesperson who can turn any criticism to the advantage of their employer