brocket vs Cervus elaphus

brocket and Cervus elaphus both are nouns.

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

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

Other hypernyms of brocket include American elk, elk, red deer, wapiti.

brocket (noun)	Cervus elaphus (noun)
small South American deer with unbranched antlers	common deer of temperate Europe and Asia
male red deer in its second year