ethic vs moral principle

ethic and moral principle both are nouns.

Word	Noun	Adjective	Verb	Adverb
ethic	Yes	No	No	No
moral principle	Yes	No	No	No

As nouns, ethic and moral principle are synonyms defined as:

ethic and moral principle: the principles of right and wrong that are accepted by an individual or a social group

Other synonyms of ethic include value-system, value orientation.

ethic (noun)	moral principle (noun)
the principles of right and wrong that are accepted by an individual or a social group	the principles of right and wrong that are accepted by an individual or a social group
a system of principles governing morality and acceptable conduct	the principle that conduct should be moral