hedonism vs ethical motive

hedonism and ethical motive both are nouns.

Word	Noun	Adjective	Verb	Adverb
hedonism	Yes	No	No	No
ethical motive	Yes	No	No	No

As nouns, ethical motive is a hypernym of hedonism; that is, ethical motive is a word with a broader meaning than hedonism:

Other hypernyms of hedonism include ethics, morality, morals.

hedonism (noun)	ethical motive (noun)
an ethical system that evaluates the pursuit of pleasure as the highest good	motivation based on ideas of right and wrong
the pursuit of pleasure as a matter of ethical principle