chiropteran vs placental mammal

chiropteran and placental mammal both are nouns.

Word	Noun	Adjective	Verb	Adverb
chiropteran	Yes	No	No	No
placental mammal	Yes	No	No	No

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

chiropteran: nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate
placental mammal: mammals having a placenta; all mammals except monotremes and marsupials

Other hypernyms of chiropteran include eutherian, eutherian mammal, placental.

chiropteran (noun)	placental mammal (noun)
nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate	mammals having a placenta; all mammals except monotremes and marsupials