whoop it up vs carouse

whoop it up is not a noun while carouse is a noun.

Word	Noun	Adjective	Verb	Adverb
whoop it up	No	No	Yes	No
carouse	Yes	No	Yes	No

As verbs, carouse is a hyponym of whoop it up; that is, carouse is a word with a more specific, narrower meaning than whoop it up:

whoop it up: celebrate noisily, often indulging in drinking; engage in uproarious festivities
carouse: engage in boisterous, drunken merrymaking

Other hyponyms of whoop it up include riot, roister.

whoop it up (noun)	carouse (noun)
	revelry in drinking; a merry drinking party

whoop it up (verb)	carouse (verb)
celebrate noisily, often indulging in drinking; engage in uproarious festivities	engage in boisterous, drunken merrymaking