deep kiss vs French kiss

deep kiss and French kiss both are nouns.

Word	Noun	Adjective	Verb	Adverb
deep kiss	Yes	No	No	No
French kiss	Yes	No	No	No

As nouns, deep kiss and French kiss are synonyms defined as:

deep kiss and French kiss: an openmouthed kiss in which your tongue is inserted into the other's mouth

Other synonyms of deep kiss include soul kiss.

deep kiss (noun)	French kiss (noun)
an openmouthed kiss in which your tongue is inserted into the other's mouth	an openmouthed kiss in which your tongue is inserted into the other's mouth