soul kiss vs deep kiss

soul kiss and deep kiss both are nouns.

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

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

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

Other synonyms of soul kiss include French kiss.

soul kiss (noun)	deep 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