thud vs clump

thud and clump both are nouns.

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

As nouns, thud and clump are synonyms defined as:

Other synonyms of thud include clunk, thump, thumping.

thud (noun)	clump (noun)
a heavy dull sound (as made by impact of heavy objects)	a heavy dull sound (as made by impact of heavy objects)
	a grouping of a number of similar things
	a compact mass

thud (verb)	clump (verb)
strike with a dull sound	gather or cause to gather into a cluster
make a dull sound	walk clumsily
make a noise typical of an engine lacking lubricants	come together as in a cluster or flock
	make or move along with a sound as of a horse's hooves striking the ground