pere david's deer vs Elaphurus davidianus

pere david's deer and Elaphurus davidianus both are nouns.

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

As nouns, pere david's deer and Elaphurus davidianus are synonyms defined as:

pere david's deer and Elaphurus davidianus: large Chinese deer surviving only in domesticated herds

Other synonyms of pere david's deer include elaphure.

pere david's deer (noun)	Elaphurus davidianus (noun)
large Chinese deer surviving only in domesticated herds	large Chinese deer surviving only in domesticated herds