dirty word vs behind

dirty word and behind both are nouns.

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

dirty word (noun)	behind (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

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

dirty word (adverb)	behind (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