incontinency vs excretion

incontinency and excretion both are nouns.

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

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

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

incontinency (noun)	excretion (noun)
involuntary urination or defecation	the bodily process of discharging waste matter
	waste matter (as urine or sweat but especially feces) discharged from the body