rear end vs body waste

rear end and body waste both are nouns.

Word	Noun	Adjective	Verb	Adverb
rear end	Yes	No	No	No
body waste	Yes	No	No	No

rear end (noun)	body waste (noun)
the fleshy part of the human body that you sit on	waste matter (as urine or sweat but especially feces) discharged from the body