wassail vs whoop it up

wassail is a noun but whoop it up is not a noun.

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

As verbs, wassail and whoop it up are synonyms defined as:

wassail and whoop it up: celebrate noisily, often indulging in drinking; engage in uproarious festivities

Other synonyms of wassail include jollify, make happy, make merry, make whoopee, racket, revel.

wassail (noun)	whoop it up (noun)
a punch made of sweetened ale or wine heated with spices and roasted apples; especially at Christmas

wassail (verb)	whoop it up (verb)
propose a toast to	celebrate noisily, often indulging in drinking; engage in uproarious festivities
celebrate noisily, often indulging in drinking; engage in uproarious festivities