colonizer

Noun

 * 1) One who colonizes:
 * 2) One who makes a group or place into a colony; one who establishes a colonial relationship.
 * 3) One who establishes or joins a colony; a colonist.
 * 4) One who intrudes and takes over.
 * 5)  A species that establishes itself in a new area.
 * 6)  A white person.