pee vs excreta

pee and excreta both are nouns.

Word	Noun	Adjective	Verb	Adverb
pee	Yes	No	Yes	No
excreta	Yes	No	No	No

As nouns, excreta is a hypernym of pee; that is, excreta is a word with a broader meaning than pee:

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

Other hypernyms of pee include body waste, excrement, excretion, excretory product.

pee (noun)	excreta (noun)
informal terms for urination	waste matter (as urine or sweat but especially feces) discharged from the body
liquid excretory product

pee (verb)	excreta (verb)
eliminate urine