sex vs put down

sex is a noun but put down is not a noun.

Word	Noun	Adjective	Verb	Adverb
sex	Yes	No	Yes	No
put down	No	No	Yes	No

sex (noun)	put down (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)	put down (verb)
tell the sex (of young chickens)	put down in writing; of texts, musical compositions, etc.
to evoke sexual feelings	make a record of; set down in permanent form
	put in a horizontal position
	remove (cargo, people, etc.) from and leave
	cause to sit or seat or be in a settled position or place
	put (an animal) to death
	reduce in worth or character, usually verbally
	cause to come to the ground