secret ballot vs voting

secret ballot and voting both are nouns.

Word	Noun	Adjective	Verb	Adverb
secret ballot	Yes	No	No	No
voting	Yes	No	No	No

As nouns, voting is a hypernym of secret ballot; that is, voting is a word with a broader meaning than secret ballot:

secret ballot: a vote in which each person's choice is secret but the totaled votes are public
voting: a choice that is made by counting the number of people in favor of each alternative

Other hypernyms of secret ballot include ballot, balloting, vote.

secret ballot (noun)	voting (noun)
a vote in which each person's choice is secret but the totaled votes are public	a choice that is made by counting the number of people in favor of each alternative