bird of Jove vs harpy

bird of Jove and harpy both are nouns.

Word	Noun	Adjective	Verb	Adverb
bird of Jove	Yes	No	No	No
harpy	Yes	No	No	No

As nouns, harpy is a hyponym of bird of Jove; that is, harpy is a word with a more specific, narrower meaning than bird of Jove:

bird of Jove: any of various large keen-sighted diurnal birds of prey noted for their broad wings and strong soaring flight
harpy: large black-and-white crested eagle of tropical America

bird of Jove (noun)	harpy (noun)
any of various large keen-sighted diurnal birds of prey noted for their broad wings and strong soaring flight	large black-and-white crested eagle of tropical America
	any of various fruit bats of the genus Nyctimene distinguished by nostrils drawn out into diverging tubes
	a malicious woman with a fierce temper