chief

A leader or head of a group of people, organisation, etc.

(heraldry) The top part of a shield or escutcheon; more specifically, an ordinary consisting of the upper part of the field cut off by a horizontal line, generally occupying the top third.

The principal part or top of anything.

(sometimes ironic) An informal term of address.

(US, Canada, offensive) An informal term of address for a Native American or First Nations man.