fondling vs kissing

fondling and kissing both are nouns.

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

As nouns, fondling and kissing are synonyms defined as:

fondling and kissing: affectionate play (or foreplay without contact with the genital organs)

Other synonyms of fondling include caressing, cuddling, hugging, necking, petting, smooching, snuggling.

fondling (noun)	kissing (noun)
affectionate play (or foreplay without contact with the genital organs)	affectionate play (or foreplay without contact with the genital organs)