osculate vs osculation

osculate is not a noun while osculation is a noun.

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

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

osculate (verb)	osculation (verb)
touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.
have at least three points in common with
be intermediate between two taxonomic groups