preemption vs legal principle

preemption and legal principle both are nouns.

Word	Noun	Adjective	Verb	Adverb
preemption	Yes	No	No	No
legal principle	Yes	No	No	No

As nouns, legal principle is a hypernym of preemption; that is, legal principle is a word with a broader meaning than preemption:

preemption: the judicial principle asserting the supremacy of federal over state legislation on the same subject
legal principle: (law) a principle underlying the formulation of jurisprudence

Other hypernyms of preemption include judicial doctrine, judicial principle.

preemption (noun)	legal principle (noun)
a prior appropriation of something	(law) a principle underlying the formulation of jurisprudence
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