excretion vs peeing

excretion and peeing both are nouns.

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

excretion (noun)	peeing (noun)
the bodily process of discharging waste matter	informal terms for urination
waste matter (as urine or sweat but especially feces) discharged from the body