thumping vs humongous

thumping is a noun but humongous is not a noun.

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

As adjectives, thumping and humongous are synonyms defined as:

Other synonyms of thumping include banging, walloping, whopping.

thumping (noun)	humongous (noun)
a heavy dull sound (as made by impact of heavy objects)

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