necking vs sex

necking and sex both are nouns.

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

necking (noun)	sex (noun)
affectionate play (or foreplay without contact with the genital organs)	activities associated with sexual intercourse
the molding at the top of a column	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

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