American elk vs brocket

American elk and brocket both are nouns.

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

As nouns, brocket is a hyponym of American elk; that is, brocket is a word with a more specific, narrower meaning than American elk:

Other hyponyms of American elk include hart, stag, hind.

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