megabat vs chiropteran

megabat and chiropteran both are nouns.

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

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

megabat: 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 megabat include bat.

megabat (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