sex vs inconstancy

sex and inconstancy both are nouns.

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

sex (noun)	inconstancy (noun)
activities associated with sexual intercourse	the quality of being changeable and variable
the properties that distinguish organisms on the basis of their reproductive roles	unfaithfulness by virtue of being unreliable or treacherous
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)	inconstancy (verb)
tell the sex (of young chickens)
to evoke sexual feelings