necking vs stimulation

necking and stimulation both are nouns.

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

As nouns, stimulation is a hypernym of necking; that is, stimulation is a word with a broader meaning than necking:

necking: affectionate play (or foreplay without contact with the genital organs)
stimulation: mutual sexual fondling prior to sexual intercourse

Other hypernyms of necking include arousal, foreplay.

necking (noun)	stimulation (noun)
affectionate play (or foreplay without contact with the genital organs)	the act of arousing an organism to action
the molding at the top of a column	mutual sexual fondling prior to sexual intercourse
	any stimulating information or event; acts to arouse action
	(physiology) the effect of a stimulus (on nerves or organs etc.)