kissing vs smooching

kissing and smooching both are nouns.

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

As nouns, kissing and smooching are synonyms defined as:

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

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

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