placental mammal vs eutherian

placental mammal and eutherian both are nouns.

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

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

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

Other synonyms of placental mammal include eutherian mammal, placental.

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

placental mammal (adjective)	eutherian (adjective)
	of or relating to or belonging to the subclass Eutheria