pere david's deer vs cervid

pere david's deer and cervid both are nouns.

Word	Noun	Adjective	Verb	Adverb
pere david's deer	Yes	No	No	No
cervid	Yes	No	No	No

As nouns, cervid is a hypernym of pere david's deer; that is, cervid is a word with a broader meaning than pere david's deer:

pere david's deer: large Chinese deer surviving only in domesticated herds
cervid: distinguished from Bovidae by the male's having solid deciduous antlers

Other hypernyms of pere david's deer include deer.

pere david's deer (noun)	cervid (noun)
large Chinese deer surviving only in domesticated herds	distinguished from Bovidae by the male's having solid deciduous antlers