vulgarism vs illegitimate

vulgarism and illegitimate both are nouns.

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

vulgarism (noun)	illegitimate (noun)
the quality of lacking taste and refinement	the illegitimate offspring of unmarried parents
an offensive or indecent word or phrase

vulgarism (adjective)	illegitimate (adjective)
	of marriages and offspring; not recognized as lawful
	contrary to or forbidden by law