have sex vs dirty word

have sex is not a noun while dirty word is a noun.

Word	Noun	Adjective	Verb	Adverb
have sex	No	No	Yes	No
dirty word	Yes	No	No	No

have sex (noun)	dirty word (noun)
	an offensive or indecent word or phrase
	a word that is considered to be unmentionable

have sex (verb)	dirty word (verb)
have sexual intercourse with