sex activity vs wind up

sex activity is a noun but wind up is not a noun.

Word	Noun	Adjective	Verb	Adverb
sex activity	Yes	No	No	No
wind up	No	No	Yes	No

sex activity (noun)	wind up (noun)
activities associated with sexual intercourse

sex activity (verb)	wind up (verb)
	finally be or do something
	coil the spring of (some mechanical device) by turning a stem
	to evoke sexual feelings
	give a preliminary swing to the arm pitching