excrement vs weewee

excrement and weewee both are nouns.

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

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

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

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