Cervus elaphus vs cervid

Cervus elaphus and cervid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cervus elaphus	Yes	No	No	No
cervid	Yes	No	No	No

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

Cervus elaphus: common deer of temperate Europe and Asia
cervid: distinguished from Bovidae by the male's having solid deciduous antlers

Other hypernyms of Cervus elaphus include deer.

Cervus elaphus (noun)	cervid (noun)
common deer of temperate Europe and Asia	distinguished from Bovidae by the male's having solid deciduous antlers