compression vs crunch

compression and crunch both are nouns.

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

As nouns, crunch is a hyponym of compression; that is, crunch is a word with a more specific, narrower meaning than compression:

Other hyponyms of compression include squeeze, squeezing, condensation, condensing, compaction, crush, constriction.

compression (noun)	crunch (noun)
applying pressure	the act of crushing
encoding information while reducing the bandwidth or bits required	the sound of something crunching
the process or result of becoming smaller or pressed together	a critical situation that arises because of a shortage (as a shortage of time or money or resources)
an increase in the density of something

compression (verb)	crunch (verb)
	reduce to small pieces or particles by pounding or abrading
	make a crushing noise
	crush with the teeth, making a grinding sound
	press or grind with a crushing noise