primate vs placental mammal

primate and placental mammal both are nouns.

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

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

primate: any placental mammal of the order Primates; has good eyesight and flexible hands and feet
placental mammal: mammals having a placenta; all mammals except monotremes and marsupials

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

primate (noun)	placental mammal (noun)
any placental mammal of the order Primates; has good eyesight and flexible hands and feet	mammals having a placenta; all mammals except monotremes and marsupials
a senior clergyman and dignitary