sex vs lesbian

sex and lesbian both are nouns.

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

sex (noun)	lesbian (noun)
activities associated with sexual intercourse	a female homosexual
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 (adjective)	lesbian (adjective)
	of or relating to or characterized by homosexual relations between woman

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