master

One that has control over another person, a group of persons, or a thing, especially.

The owner or keeper of an animal.

The owner of a slave.

One who has control over or ownership of something.

An employer.

The man who serves as the head of a household.

One who defeats another; a victor.

A man who acts out the role of the dominating partner in a sadomasochistic relationship.

The captain of a merchant ship.