inconstant vs sex

inconstant is not a noun while sex is a noun.

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

inconstant (noun)	sex (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

inconstant (adjective)	sex (adjective)
likely to change frequently often without apparent or cogent reason; variable

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