vulgarity vs vulgarism

vulgarity and vulgarism both are nouns.

Word	Noun	Adjective	Verb	Adverb
vulgarity	Yes	No	No	No
vulgarism	Yes	No	No	No

As nouns, vulgarity and vulgarism are synonyms defined as:

Other synonyms of vulgarity include coarseness, commonness, grossness, raunch.

vulgarity (noun)	vulgarism (noun)
the quality of lacking taste and refinement	the quality of lacking taste and refinement
	an offensive or indecent word or phrase