buss vs French kiss

buss and French kiss both are nouns.

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

As nouns, French kiss is a hyponym of buss; that is, French kiss is a word with a more specific, narrower meaning than buss:

buss: the act of caressing with the lips (or an instance thereof)
French kiss: an openmouthed kiss in which your tongue is inserted into the other's mouth

Other hyponyms of buss include smack, smooch, deep kiss, soul kiss, peck.

buss (noun)	French kiss (noun)
the act of caressing with the lips (or an instance thereof)	an openmouthed kiss in which your tongue is inserted into the other's mouth

buss (verb)	French kiss (verb)
touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.