tree shrew vs placental

tree shrew and placental both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree shrew	Yes	No	No	No
placental	Yes	Yes	No	No

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

tree shrew: insectivorous arboreal mammal of southeast Asia that resembles a squirrel with large eyes and long sharp snout
placental: mammals having a placenta; all mammals except monotremes and marsupials

Other hypernyms of tree shrew include eutherian, eutherian mammal, placental mammal.

tree shrew (noun)	placental (noun)
insectivorous arboreal mammal of southeast Asia that resembles a squirrel with large eyes and long sharp snout	mammals having a placenta; all mammals except monotremes and marsupials

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