sexual activity vs wind up

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

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

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

sexual 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