harpy vs megabat

harpy and megabat both are nouns.

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

As nouns, megabat is a hypernym of harpy; that is, megabat is a word with a broader meaning than harpy:

harpy: any of various fruit bats of the genus Nyctimene distinguished by nostrils drawn out into diverging tubes
megabat: large Old World bat of warm and tropical regions that feeds on fruit

Other hypernyms of harpy include fruit bat.

harpy (noun)	megabat (noun)
large black-and-white crested eagle of tropical America	large Old World bat of warm and tropical regions that feeds on fruit
any of various fruit bats of the genus Nyctimene distinguished by nostrils drawn out into diverging tubes
a malicious woman with a fierce temper