placental vs eutherian

placental and eutherian both are nouns.

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

As nouns, placental and eutherian are synonyms defined as:

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

Other synonyms of placental include eutherian mammal, placental mammal.

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

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