brocket vs American elk

brocket and American elk both are nouns.

Word	Noun	Adjective	Verb	Adverb
brocket	Yes	No	No	No
American elk	Yes	No	No	No

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

Other hypernyms of brocket include Cervus elaphus, elk, red deer, wapiti.

brocket (noun)	American elk (noun)
small South American deer with unbranched antlers	large North American deer with large much-branched antlers in the male
male red deer in its second year	common deer of temperate Europe and Asia