preemption vs preempt

preemption and preempt both are nouns.

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

preemption (noun)	preempt (noun)
a prior appropriation of something	a high bid that is intended to prevent the opposing players from bidding
the right to purchase something in advance of others
the right of a government to seize or appropriate something (as property)
the judicial principle asserting the supremacy of federal over state legislation on the same subject

preemption (verb)	preempt (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