filth vs dirty word

filth and dirty word both are nouns.

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

As nouns, filth and dirty word are synonyms defined as:

Other synonyms of filth include obscenity, smut, vulgarism.

filth (noun)	dirty word (noun)
an offensive or indecent word or phrase	an offensive or indecent word or phrase
a state characterized by foul or disgusting dirt and refuse	a word that is considered to be unmentionable
anything regarded as making something unclean
any substance considered disgustingly foul or unpleasant