evacuation vs expelling

evacuation and expelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
evacuation	Yes	No	No	No
expelling	Yes	No	No	No

As nouns, expelling is a hypernym of evacuation; that is, expelling is a word with a broader meaning than evacuation:

evacuation: the bodily process of discharging waste matter
expelling: any of several bodily processes by which substances go out of the body

Other hypernyms of evacuation include discharge, emission.

evacuation (noun)	expelling (noun)
the act of removing the contents of something	any of several bodily processes by which substances go out of the body
the act of evacuating; leaving a place in an orderly fashion; especially for protection
the bodily process of discharging waste matter