excretory product vs backside

excretory product and backside both are nouns.

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

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