posterior vs dirty word

posterior and dirty word both are nouns.

Word	Noun	Adjective	Verb	Adverb
posterior	Yes	Yes	No	No
dirty word	Yes	No	No	No

posterior (noun)	dirty word (noun)
the fleshy part of the human body that you sit on	an offensive or indecent word or phrase
a tooth situated at the back of the mouth	a word that is considered to be unmentionable

posterior (adjective)	dirty word (adjective)
located at or near or behind a part or near the end of a structure
coming at a subsequent time or stage