arse vs asshole

arse and asshole both are nouns.

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

As nouns, arse and asshole are synonyms defined as:

Other synonyms of arse include arsehole, bunghole.

arse (noun)	asshole (noun)
vulgar slang for anus	vulgar slang for anus
the fleshy part of the human body that you sit on	insulting terms of address for people who are stupid or irritating or ridiculous