thumping vs thud

thumping and thud both are nouns.

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

As nouns, thumping and thud are synonyms defined as:

thumping and thud: a heavy dull sound (as made by impact of heavy objects)

Other synonyms of thumping include clump, clunk, thump.

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

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

thumping (verb)	thud (verb)
	strike with a dull sound
	make a dull sound
	make a noise typical of an engine lacking lubricants