smooching vs foreplay

smooching and foreplay both are nouns.

Word	Noun	Adjective	Verb	Adverb
smooching	Yes	No	No	No
foreplay	Yes	No	No	No

As nouns, foreplay is a hypernym of smooching; that is, foreplay is a word with a broader meaning than smooching:

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

Other hypernyms of smooching include arousal, stimulation.

smooching (noun)	foreplay (noun)
affectionate play (or foreplay without contact with the genital organs)	mutual sexual fondling prior to sexual intercourse