body waste vs posterior

body waste and posterior both are nouns.

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

body waste (noun)	posterior (noun)
waste matter (as urine or sweat but especially feces) discharged from the body	the fleshy part of the human body that you sit on
	a tooth situated at the back of the mouth

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