obscenity vs illegitimate

obscenity and illegitimate both are nouns.

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

obscenity (noun)	illegitimate (noun)
an obscene act	the illegitimate offspring of unmarried parents
the trait of behaving in an obscene manner
an offensive or indecent word or phrase

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