osculation vs sex activity

osculation and sex activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
osculation	Yes	No	No	No
sex activity	Yes	No	No	No

osculation (noun)	sex activity (noun)
the act of caressing with the lips (or an instance thereof)	activities associated with sexual intercourse
(mathematics) a contact of two curves (or two surfaces) at which they have a common tangent