vulgarism vs rear end

vulgarism and rear end both are nouns.

Word	Noun	Adjective	Verb	Adverb
vulgarism	Yes	No	No	No
rear end	Yes	No	No	No

vulgarism (noun)	rear end (noun)
the quality of lacking taste and refinement	the fleshy part of the human body that you sit on
an offensive or indecent word or phrase