fondling vs foreplay

fondling and foreplay both are nouns.

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

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

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

Other hypernyms of fondling include arousal, stimulation.

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