clump vs thud

clump and thud both are nouns.

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

As nouns, clump and thud are synonyms defined as:

Other synonyms of clump include clunk, thump, thumping.

clump (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)
a grouping of a number of similar things
a compact mass

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