behind vs dirty word

behind and dirty word both are nouns.

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

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

behind (adjective)	dirty word (adjective)
having the lower score or lagging position in a contest

behind (adverb)	dirty word (adverb)
in or to or toward the rear
remaining in a place or condition that has been left or departed from
in debt
in or into an inferior position
showing a time that is earlier than the actual time