soul kiss vs French kiss

soul kiss and French kiss both are nouns.

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

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

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

Other synonyms of soul kiss include deep kiss.

soul 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