rotten vs dirty word

rotten is not a noun while dirty word is a noun.

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

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

rotten (adjective)	dirty word (adjective)
having decayed or disintegrated; usually implies foulness
damaged by decay; hence unsound and useless
very bad