proboscidean vs placental

proboscidean and placental both are nouns.

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

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

proboscidean: massive herbivorous mammals having tusks and a long trunk
placental: mammals having a placenta; all mammals except monotremes and marsupials

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

proboscidean (noun)	placental (noun)
massive herbivorous mammals having tusks and a long trunk	mammals having a placenta; all mammals except monotremes and marsupials

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