eutherian vs placental

eutherian and placental both are nouns.

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

As nouns, eutherian and placental are synonyms defined as:

eutherian and placental: mammals having a placenta; all mammals except monotremes and marsupials

Other synonyms of eutherian include eutherian mammal, placental mammal.

eutherian (noun)	placental (noun)
mammals having a placenta; all mammals except monotremes and marsupials	mammals having a placenta; all mammals except monotremes and marsupials

eutherian (adjective)	placental (adjective)
of or relating to or belonging to the subclass Eutheria	pertaining to or having or occurring by means of a placenta