moral principle vs value-system

moral principle and value-system both are nouns.

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

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

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

Other synonyms of moral principle include ethic, value orientation.

moral principle (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
the principle that conduct should be moral