chiropteran vs eutherian

chiropteran and eutherian both are nouns.

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

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

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

chiropteran (noun)	eutherian (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

chiropteran (adjective)	eutherian (adjective)
	of or relating to or belonging to the subclass Eutheria