filth vs rear end

filth and rear end both are nouns.

Word	Noun	Adjective	Verb	Adverb
filth	Yes	No	No	No
rear end	Yes	No	No	No

filth (noun)	rear end (noun)
an offensive or indecent word or phrase	the fleshy part of the human body that you sit on
a state characterized by foul or disgusting dirt and refuse
anything regarded as making something unclean
any substance considered disgustingly foul or unpleasant