write-in candidate vs write-in

write-in candidate and write-in both are nouns.

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

As nouns, write-in candidate and write-in are synonyms defined as:

write-in candidate and write-in: 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 candidate (noun)	write-in (noun)
a candidate for public office whose name does not appear on the ballot and so must be written on the ballot by the voters	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