write-in vs voting

write-in and voting both are nouns.

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

As nouns, voting is a hypernym of write-in; that is, voting is a word with a broader meaning than write-in:

write-in: a vote cast by writing in the name of a candidate who is not listed on the ballot
voting: a choice that is made by counting the number of people in favor of each alternative

Other hypernyms of write-in include ballot, balloting, vote.

write-in (noun)	voting (noun)
a vote cast by writing in the name of a candidate who is not listed on the ballot	a choice that is made by counting the number of people in favor of each alternative
a candidate for public office whose name does not appear on the ballot and so must be written on the ballot by the voters