put down vs put-down

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

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