concubine vs sex

concubine and sex both are nouns.

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

concubine (noun)	sex (noun)
a woman who cohabits with an important man	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

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