body waste vs feces

body waste and feces both are nouns.

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

As nouns, feces is a hyponym of body waste; that is, feces is a word with a more specific, narrower meaning than body waste:

body waste: waste matter (as urine or sweat but especially feces) discharged from the body
feces: solid excretory product evacuated from the bowels

body waste (noun)	feces (noun)
waste matter (as urine or sweat but especially feces) discharged from the body	solid excretory product evacuated from the bowels