excretion vs weewee

excretion and weewee both are nouns.

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

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

excretion: waste matter (as urine or sweat but especially feces) discharged from the body
weewee: liquid excretory product

excretion (noun)	weewee (noun)
the bodily process of discharging waste matter	liquid excretory product
waste matter (as urine or sweat but especially feces) discharged from the body