pachyderm vs eutherian mammal

pachyderm and eutherian mammal both are nouns.

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

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

pachyderm: any of various nonruminant hoofed mammals having very thick skin: elephant, rhinoceros, hippopotamus
eutherian mammal: mammals having a placenta; all mammals except monotremes and marsupials

Other hypernyms of pachyderm include eutherian, placental, placental mammal.

pachyderm (noun)	eutherian mammal (noun)
any of various nonruminant hoofed mammals having very thick skin: elephant, rhinoceros, hippopotamus	mammals having a placenta; all mammals except monotremes and marsupials