pre-emption vs legal right

pre-emption and legal right both are nouns.

Word	Noun	Adjective	Verb	Adverb
pre-emption	Yes	No	No	No
legal right	Yes	No	No	No

As nouns, legal right is a hypernym of pre-emption; that is, legal right is a word with a broader meaning than pre-emption:

pre-emption: the right of a government to seize or appropriate something (as property)
legal right: a right based in law

pre-emption (noun)	legal right (noun)
a prior appropriation of something	a right based in law
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