sex vs lewdly

sex is a noun but lewdly is not a noun.

Word	Noun	Adjective	Verb	Adverb
sex	Yes	No	Yes	No
lewdly	No	No	No	Yes

sex (noun)	lewdly (noun)
activities associated with sexual intercourse
the properties that distinguish organisms on the basis of their reproductive roles
all of the feelings resulting from the urge to gratify sexual impulses
either of the two categories (male or female) into which most organisms are divided

sex (verb)	lewdly (verb)
tell the sex (of young chickens)
to evoke sexual feelings

sex (adverb)	lewdly (adverb)
	in a lewd and obscene manner