multiple voting vs voting

multiple voting and voting both are nouns.

Word	Noun	Adjective	Verb	Adverb
multiple voting	Yes	No	No	No
voting	Yes	No	No	No

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

multiple voting: the act of voting in more than one place by the same person at the same election (illegal in U.S.)
voting: a choice that is made by counting the number of people in favor of each alternative

Other hypernyms of multiple voting include ballot, balloting, vote.

multiple voting (noun)	voting (noun)
the act of voting in more than one place by the same person at the same election (illegal in U.S.)	a choice that is made by counting the number of people in favor of each alternative