preemptor

One who preëmpts; especially, one who takes up land with the privilege of preëmption.

One who preëmpts; esp., one who preëmpts public land.

One who preempts; especially, one who appropriates public land.

a bidder in bridge who makes a preemptive bid

someone who acquires land by preemption

someone who acquires land by preemption

a bidder in bridge who makes a preemptive bid