clunk vs thud

clunk and thud both are nouns.

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

As nouns, clunk and thud are synonyms defined as:

Other synonyms of clunk include clump, thump, thumping.

clunk (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)

clunk (verb)	thud (verb)
make or move along with a sound as of a horse's hooves striking the ground	strike with a dull sound
	make a dull sound
	make a noise typical of an engine lacking lubricants