backside vs excretory product

backside and excretory product both are nouns.

Word	Noun	Adjective	Verb	Adverb
backside	Yes	No	No	No
excretory product	Yes	No	No	No

backside (noun)	excretory product (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
the side of an object that is opposite its front