A jack (in any of the senses referring to types of fish).
Any bird of the family Monarchidae.
The ruler of an absolute monarchy or the head of state of a constitutional monarchy.
The monarch butterfly, Danaus plexippus, and others of genus Danaus, found primarily in North America, so called because of the designs on its wings.
A stag which has sixteen or more points or tines on its antlers.
The chief or best thing of its kind.
A police officer.