thud

nouns

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

clump, clunk, thud, thump, thumping

make a dull sound

"the knocker thudded against the front door"

thud, thump

strike with a dull sound

"Bullets were thudding against the wall"

thud

is a type of (narrower)

hit against; come into sudden contact with

"The car hit a tree"; "He struck the table with his elbow"

make a noise typical of an engine lacking lubricants

crump, scrunch, thud