derriere vs excrement

derriere and excrement both are nouns.

Word	Noun	Adjective	Verb	Adverb
derriere	Yes	No	No	No
excrement	Yes	No	No	No

derriere (noun)	excrement (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