livestock vs placental mammal

livestock and placental mammal both are nouns.

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

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

livestock: any animals kept for use or profit
placental mammal: mammals having a placenta; all mammals except monotremes and marsupials

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

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