fruit bat vs chiropteran

fruit bat and chiropteran both are nouns.

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

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

fruit bat: large Old World bat of warm and tropical regions that feeds on fruit
chiropteran: nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate

Other hypernyms of fruit bat include bat.

fruit bat (noun)	chiropteran (noun)
large Old World bat of warm and tropical regions that feeds on fruit	nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate