sex vs wind up

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

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

As verbs, sex and wind up are synonyms defined as:

Other synonyms of sex include arouse, excite, turn on.

sex (noun)	wind up (noun)
activities associated with sexual intercourse
the properties that distinguish organisms on the basis of their reproductive roles
all of the feelings resulting from the urge to gratify sexual impulses
either of the two categories (male or female) into which most organisms are divided

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