thud vs crunch

thud and crunch both are nouns.

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

As verbs, crunch is a hypernym of thud; that is, crunch is a word with a broader meaning than thud:

Other hypernyms of thud include crackle, scranch, scraunch.

thud (noun)	crunch (noun)
a heavy dull sound (as made by impact of heavy objects)	the act of crushing
	the sound of something crunching
	a critical situation that arises because of a shortage (as a shortage of time or money or resources)

thud (verb)	crunch (verb)
strike with a dull sound	reduce to small pieces or particles by pounding or abrading
make a dull sound	make a crushing noise
make a noise typical of an engine lacking lubricants	crush with the teeth, making a grinding sound
	press or grind with a crushing noise