laxation vs evacuation

laxation and evacuation both are nouns.

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

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

Other hypernyms of laxation include elimination, excreting, excretion, voiding.

laxation (noun)	evacuation (noun)
the act of making something less tight	the act of removing the contents of something
the elimination of fecal waste through the anus	the act of evacuating; leaving a place in an orderly fashion; especially for protection
	the bodily process of discharging waste matter