Buddhist culture, page-265

Is there a difference between morality and ethics? not really. both are merely English words pointing to the same thing.

"ethics" is more favourable for those who fear/shirk at offending immoral people

Ethics or moral philosophy is a branch of philosophy that "involves systematizing, defending, and recommending concepts of right and wrong behavior". The field of ethics, along with aesthetics, concerns matters of value; these fields comprise the branch of philosophy called axiology. Wikipedia