dirty word vs vulgarism

dirty word and vulgarism both are nouns.

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

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

Other synonyms of dirty word include filth, obscenity, smut.

dirty word (noun)	vulgarism (noun)
an offensive or indecent word or phrase	the quality of lacking taste and refinement
a word that is considered to be unmentionable	an offensive or indecent word or phrase