evacuation vs laxation

evacuation and laxation both are nouns.

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

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

Other hyponyms of evacuation include defecation, shitting, incontinence, incontinency, micturition, urination.

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