moral sense vs ethics

moral sense and ethics both are nouns.

Word	Noun	Adjective	Verb	Adverb
moral sense	Yes	No	No	No
ethics	Yes	No	No	No

As nouns, ethics is a hypernym of moral sense; that is, ethics is a word with a broader meaning than moral sense:

moral sense: motivation deriving logically from ethical or moral principles that govern a person's thoughts and actions
ethics: motivation based on ideas of right and wrong

Other hypernyms of moral sense include ethical motive, morality, morals.

moral sense (noun)	ethics (noun)
motivation deriving logically from ethical or moral principles that govern a person's thoughts and actions	the philosophical study of moral values and rules
	motivation based on ideas of right and wrong