write in vs write-in

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

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