colonizer

Short definition from Wiktionary

Noun

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