excreta vs waste material

excreta and waste material both are nouns.

Word	Noun	Adjective	Verb	Adverb
excreta	Yes	No	No	No
waste material	Yes	No	No	No

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

excreta: waste matter (as urine or sweat but especially feces) discharged from the body
waste material: any materials unused and rejected as worthless or unwanted

Other hypernyms of excreta include waste, waste matter, waste product.

excreta (noun)	waste material (noun)
waste matter (as urine or sweat but especially feces) discharged from the body	any materials unused and rejected as worthless or unwanted