harpy bat vs fruit bat

harpy bat and fruit bat both are nouns.

Word	Noun	Adjective	Verb	Adverb
harpy bat	Yes	No	No	No
fruit bat	Yes	No	No	No

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

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

Other hypernyms of harpy bat include megabat.

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