body waste vs waste material

body waste and waste material both are nouns.

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

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

body waste: 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 body waste include waste, waste matter, waste product.

body waste (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