harpy vs harpy eagle

harpy and harpy eagle both are nouns.

Word	Noun	Adjective	Verb	Adverb
harpy	Yes	No	No	No
harpy eagle	Yes	No	No	No

As nouns, harpy and harpy eagle are synonyms defined as:

harpy and harpy eagle: large black-and-white crested eagle of tropical America

Other synonyms of harpy include Harpia harpyja.

harpy (noun)	harpy eagle (noun)
large black-and-white crested eagle of tropical America	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