necking vs smooching

necking and smooching both are nouns.

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

As nouns, necking and smooching are synonyms defined as:

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

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

necking (noun)	smooching (noun)
affectionate play (or foreplay without contact with the genital organs)	affectionate play (or foreplay without contact with the genital organs)
the molding at the top of a column