placental mammal vs eutherian mammal

placental mammal and eutherian mammal both are nouns.

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

As nouns, placental mammal and eutherian mammal are synonyms defined as:

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

Other synonyms of placental mammal include eutherian, placental.

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