value-system vs moral principle

value-system and moral principle both are nouns.

Word	Noun	Adjective	Verb	Adverb
value-system	Yes	No	No	No
moral principle	Yes	No	No	No

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

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

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

value-system (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
	the principle that conduct should be moral