harpy vs Harpia harpyja

harpy and Harpia harpyja both are nouns.

Word	Noun	Adjective	Verb	Adverb
harpy	Yes	No	No	No
Harpia harpyja	Yes	No	No	No

As nouns, harpy and Harpia harpyja are synonyms defined as:

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

Other synonyms of harpy include harpy eagle.

harpy (noun)	Harpia harpyja (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