proboscidian vs placental

proboscidian and placental both are nouns.

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

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

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

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

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

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