write-in vs write in

write-in is a noun but write in is not a noun.

Word	Noun	Adjective	Verb	Adverb
write-in	Yes	No	No	No
write in	No	No	Yes	No

write-in (noun)	write in (noun)
a vote cast by writing in the name of a candidate who is not listed on the ballot
a candidate for public office whose name does not appear on the ballot and so must be written on the ballot by the voters

write-in (verb)	write in (verb)
	write to an organization
	cast a vote by inserting a name that does not appear on the ballot