aardvark vs placental

aardvark and placental both are nouns.

Word	Noun	Adjective	Verb	Adverb
aardvark	Yes	No	No	No
placental	Yes	Yes	No	No

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

aardvark: nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata
placental: mammals having a placenta; all mammals except monotremes and marsupials

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

aardvark (noun)	placental (noun)
nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata	mammals having a placenta; all mammals except monotremes and marsupials

aardvark (adjective)	placental (adjective)
	pertaining to or having or occurring by means of a placenta