humongous vs banging

humongous is not a noun while banging is a noun.

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

As adjectives, humongous and banging are synonyms defined as:

Other synonyms of humongous include thumping, walloping, whopping.

humongous (noun)	banging (noun)
	the act of subjecting to strong attack
	a continuing very loud noise

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