deer vs cervid

deer and cervid both are nouns.

Word	Noun	Adjective	Verb	Adverb
deer	Yes	No	No	No
cervid	Yes	No	No	No

As nouns, deer and cervid are synonyms defined as:

deer and cervid: distinguished from Bovidae by the male's having solid deciduous antlers

deer (noun)	cervid (noun)
distinguished from Bovidae by the male's having solid deciduous antlers	distinguished from Bovidae by the male's having solid deciduous antlers