cuddling vs foreplay

cuddling and foreplay both are nouns.

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

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

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

Other hypernyms of cuddling include arousal, stimulation.

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