chiropteran vs eutherian mammal

chiropteran and eutherian mammal both are nouns.

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

As nouns, eutherian mammal is a hypernym of chiropteran; that is, eutherian 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
eutherian mammal: mammals having a placenta; all mammals except monotremes and marsupials

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

chiropteran (noun)	eutherian 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