human waste vs body waste

human waste and body waste both are nouns.

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

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

human waste: the body wastes of human beings
body waste: waste matter (as urine or sweat but especially feces) discharged from the body

Other hypernyms of human waste include excrement, excreta, excretion, excretory product.

human waste (noun)	body waste (noun)
the body wastes of human beings	waste matter (as urine or sweat but especially feces) discharged from the body