necking vs neck

necking and neck both are nouns.

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

necking (noun)	neck (noun)
affectionate play (or foreplay without contact with the genital organs)	an opening in a garment for the neck of the wearer; a part of the garment near the wearer's neck
the molding at the top of a column	a narrow part of an artifact that resembles a neck in position or form
	the part of an organism (human or animal) that connects the head to the rest of the body
	a cut of meat from the neck of an animal
	a narrow elongated projecting strip of land

necking (verb)	neck (verb)
	kiss, embrace, or fondle with sexual passion