cuddling vs kissing

cuddling and kissing both are nouns.

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

As nouns, cuddling and kissing are synonyms defined as:

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

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

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