humongous vs walloping

humongous is not a noun while walloping is a noun.

Word	Noun	Adjective	Verb	Adverb
humongous	No	Yes	No	No
walloping	Yes	Yes	No	No

As adjectives, humongous and walloping are synonyms defined as:

Other synonyms of humongous include banging, thumping, whopping.

humongous (noun)	walloping (noun)
	a sound defeat

humongous (adjective)	walloping (adjective)
(used informally) very large	(used informally) very large