incontinence vs excretion

incontinence and excretion both are nouns.

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

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

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

incontinence (noun)	excretion (noun)
indiscipline with regard to sensuous pleasures	the bodily process of discharging waste matter
involuntary urination or defecation	waste matter (as urine or sweat but especially feces) discharged from the body