As nouns the difference between duke and governor
is that
duke is the male ruler of a duchy (
compare duchess) while
governor is the leader of a region or state that is a member of a federation or an empire. In Rome, they were endorsed by the emperor and appointed by the Senate. In the modern United States, they are elected by the people of that state.
As a verb duke
is to hit or beat with the fists.
As a proper noun Duke
is the title of a duke.