ethics, moral philosophy -- (the philosophical study of moral values and rules)
Overview of noun ethic
The noun ethic has 2 senses
ethic, moral principle, value-system, value orientation -- (the principles of right and wrong that are accepted by an individual or a social group; "the Puritan ethic"; "a person with old-fashioned values")
ethic, ethical code -- (a system of principles governing morality and acceptable conduct)