decompression vs easing

decompression and easing both are nouns.

Word	Noun	Adjective	Verb	Adverb
decompression	Yes	No	No	No
easing	Yes	No	No	No

As nouns, easing is a hypernym of decompression; that is, easing is a word with a broader meaning than decompression:

decompression: relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure)
easing: the act of reducing something unpleasant (as pain or annoyance)

Other hypernyms of decompression include alleviation, easement, relief.

decompression (noun)	easing (noun)
relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure)	the act of reducing something unpleasant (as pain or annoyance)
restoring compressed information to its normal form for use or display	a change for the better