pre-empt vs preemptive bid

pre-empt and preemptive bid both are nouns.

Word	Noun	Adjective	Verb	Adverb
pre-empt	Yes	No	No	No
preemptive bid	Yes	No	No	No

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

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

Other synonyms of pre-empt include preempt.

pre-empt (noun)	preemptive bid (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