obscenity vs lewdness

obscenity and lewdness both are nouns.

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

As nouns, obscenity and lewdness are synonyms defined as:

Other synonyms of obscenity include bawdiness, salaciousness, salacity.

obscenity (noun)	lewdness (noun)
an obscene act	the trait of behaving in an obscene manner
the trait of behaving in an obscene manner
an offensive or indecent word or phrase