Gresham's Law vs principle

Gresham's Law and principle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gresham's Law	Yes	No	No	No
principle	Yes	No	No	No

As nouns, principle is a hypernym of Gresham's Law; that is, principle is a word with a broader meaning than Gresham's Law:

Gresham's Law: (economics) the principle that when two kinds of money having the same denominational value are in circulation the intrinsically more valuable money will be hoarded and the money of lower intrinsic value will circulate more freely until the intrinsically more valuable money is driven out of circulation; bad money drives out good; credited to Sir Thomas Gresham
principle: a rule or law concerning a natural phenomenon or the function of a complex system

Other hypernyms of Gresham's Law include rule.

Gresham's Law (noun)	principle (noun)
(economics) the principle that when two kinds of money having the same denominational value are in circulation the intrinsically more valuable money will be hoarded and the money of lower intrinsic value will circulate more freely until the intrinsically more valuable money is driven out of circulation; bad money drives out good; credited to Sir Thomas Gresham	a basic truth or law or assumption
	a rule or standard especially of good behavior
	(law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature)
	a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct
	a rule or law concerning a natural phenomenon or the function of a complex system
	rule of personal conduct