settler

1. Someone who settles in a new location, especially one who takes up residence in a previously uninhabited place; a colonist.
2. Someone who decides or settles something, such as a dispute.
3. (colloquial) That which settles or finishes, such as a blow that decides a contest.
4. The person in a betting shop who calculates the winnings.
5. A drink which settles the stomach, especially a bitter drink, often a nightcap.
6. A vessel, such as a tub, in which something, such as pulverized ore suspended in a liquid, is allowed to settle.