Elaphurus davidianus vs cervid

Elaphurus davidianus and cervid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Elaphurus davidianus	Yes	No	No	No
cervid	Yes	No	No	No

As nouns, cervid is a hypernym of Elaphurus davidianus; that is, cervid is a word with a broader meaning than Elaphurus davidianus:

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

Other hypernyms of Elaphurus davidianus include deer.

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