thud vs thumping

thud and thumping both are nouns.

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

As nouns, thud and thumping are synonyms defined as:

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

Other synonyms of thud include clump, clunk, thump.

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

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

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