posterior vs body waste

posterior and body waste both are nouns.

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

posterior (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
a tooth situated at the back of the mouth

posterior (adjective)	body waste (adjective)
located at or near or behind a part or near the end of a structure
coming at a subsequent time or stage