arse vs excrement

arse and excrement both are nouns.

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

arse (noun)	excrement (noun)
vulgar slang for anus	waste matter (as urine or sweat but especially feces) discharged from the body
the fleshy part of the human body that you sit on