value-system vs ethic

value-system and ethic both are nouns.

Word	Noun	Adjective	Verb	Adverb
value-system	Yes	No	No	No
ethic	Yes	No	No	No

As nouns, value-system and ethic are synonyms defined as:

value-system and ethic: the principles of right and wrong that are accepted by an individual or a social group

Other synonyms of value-system include moral principle, value orientation.

value-system (noun)	ethic (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