farm animal vs eutherian mammal

farm animal and eutherian mammal both are nouns.

Word	Noun	Adjective	Verb	Adverb
farm animal	Yes	No	No	No
eutherian mammal	Yes	No	No	No

As nouns, eutherian mammal is a hypernym of farm animal; that is, eutherian mammal is a word with a broader meaning than farm animal:

farm animal: any animals kept for use or profit
eutherian mammal: mammals having a placenta; all mammals except monotremes and marsupials

Other hypernyms of farm animal include eutherian, placental, placental mammal.

farm animal (noun)	eutherian mammal (noun)
any animals kept for use or profit	mammals having a placenta; all mammals except monotremes and marsupials