scruple vs principle

scruple and principle both are nouns.

Word	Noun	Adjective	Verb	Adverb
scruple	Yes	No	Yes	No
principle	Yes	No	No	No

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

scruple (noun)	principle (noun)
an ethical or moral principle that inhibits action	a basic truth or law or assumption
uneasiness about the fitness of an action (particularly for reasons of ethics, morals or propriety)	a rule or standard especially of good behavior
a unit of apothecary weight equal to 20 grains	(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