ethic vs value-system

ethic and value-system both are nouns.

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

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

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

Other synonyms of ethic include moral principle, value orientation.

ethic (noun)	value-system (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