osculation vs smooch

osculation and smooch both are nouns.

Word	Noun	Adjective	Verb	Adverb
osculation	Yes	No	No	No
smooch	Yes	No	Yes	No

As nouns, smooch is a hyponym of osculation; that is, smooch is a word with a more specific, narrower meaning than osculation:

Other hyponyms of osculation include smack, deep kiss, French kiss, soul kiss, peck.

osculation (noun)	smooch (noun)
the act of caressing with the lips (or an instance thereof)	an enthusiastic kiss
(mathematics) a contact of two curves (or two surfaces) at which they have a common tangent

osculation (verb)	smooch (verb)
	snuggle and lie in a position where one person faces the back of the others