preempt vs pre-empt

preempt and pre-empt both are nouns.

Word	Noun	Adjective	Verb	Adverb
preempt	Yes	No	Yes	No
pre-empt	Yes	No	No	No

As nouns, preempt and pre-empt are synonyms defined as:

preempt and pre-empt: a high bid that is intended to prevent the opposing players from bidding

Other synonyms of preempt include preemptive bid.

preempt (noun)	pre-empt (noun)
a high bid that is intended to prevent the opposing players from bidding	a high bid that is intended to prevent the opposing players from bidding

preempt (verb)	pre-empt (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