put-down vs put down

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

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

put-down (noun)	put down (noun)
a crushing remark

put-down (verb)	put down (verb)
	put down in writing; of texts, musical compositions, etc.
	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