pachyderm vs eutherian

pachyderm and eutherian both are nouns.

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

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

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

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

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

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