red deer vs brocket

red deer and brocket both are nouns.

Word	Noun	Adjective	Verb	Adverb
red deer	Yes	No	No	No
brocket	Yes	No	No	No

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

Other hyponyms of red deer include hart, stag, hind.

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