dirty word vs posterior

dirty word and posterior both are nouns.

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

dirty word (noun)	posterior (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	a tooth situated at the back of the mouth

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