A voter is a citizen who votes. In many states, it's possible to tell if you've voted in past elections (the voting log is a public record) although obviously not who you voted for. The party political machines do keep track of this in states where these records are publicly accessible, and thus can tell "voter" from "nonvoting citizen". Some citizens are not allowed to vote. The most common reason is age, as those under 18 are not generally allowed to vote, but are still citizens. Others include having been adjudicated as mentally incompetent and having been convicted of a felony.Under current law, all voters are citizens. In theory, it's possible for a state or municipality to allow noncitizens to vote in nonfederal elections, but at the present time no jurisdiction allows this. New York City used to allow noncitizens who have children in the school system to vote in school board elections, but this was repealed (in 2006, if I am not mistaken).Elector, a member of an electoral collegeConfederate elector, a member of the Electoral College (Confederate States), which elected the President Jefferson Davis, and Vice President Alexander H. StephensU.S. Presidential and Vice Presidential elector, a member of the Electoral College (United States), which formally chooses the President and Vice President of the United States