dirty word vs hind end

dirty word and hind end both are nouns.

Word	Noun	Adjective	Verb	Adverb
dirty word	Yes	No	No	No
hind end	Yes	No	No	No

dirty word (noun)	hind end (noun)
an offensive or indecent word or phrase	the fleshy part of the human body that you sit on
a word that is considered to be unmentionable