scruples vs ethics

scruples and ethics both are nouns.

Word	Noun	Adjective	Verb	Adverb
scruples	Yes	No	No	No
ethics	Yes	No	No	No

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

scruples: 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 scruples include ethical motive, morality, morals.

scruples (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