alteration vs laxation

alteration and laxation both are nouns.

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

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

alteration: the act of making something different (as e.g. the size of a garment)
laxation: the act of making something less tight

Other hyponyms of alteration include loosening, tightening, accommodation, adaptation, tune.

alteration (noun)	laxation (noun)
the act of revising or altering (involving reconsideration and modification)	the act of making something less tight
the act of making something different (as e.g. the size of a garment)	the elimination of fecal waste through the anus
an event that occurs when something passes from one state or phase to another