laxation vs excretion

laxation and excretion both are nouns.

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

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

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

laxation (noun)	excretion (noun)
the act of making something less tight	the bodily process of discharging waste matter
the elimination of fecal waste through the anus	waste matter (as urine or sweat but especially feces) discharged from the body