preempt vs preemptor

preempt and preemptor both are nouns.

Word	Noun	Adjective	Verb	Adverb
preempt	Yes	No	Yes	No
preemptor	Yes	No	No	No

preempt (noun)	preemptor (noun)
a high bid that is intended to prevent the opposing players from bidding	a bidder in bridge who makes a preemptive bid
	someone who acquires land by preemption

preempt (verb)	preemptor (verb)
acquire for oneself before others can do so
make a preemptive bid in the game of bridge
gain possession of by prior right or opportunity, especially so as to obtain the right to buy (land)
take the place of or have precedence over