sable antelope vs antelope

sable antelope and antelope both are nouns.

Word	Noun	Adjective	Verb	Adverb
sable antelope	Yes	No	No	No
antelope	Yes	No	No	No

As nouns, antelope is a hypernym of sable antelope; that is, antelope is a word with a broader meaning than sable antelope:

sable antelope: large black East African antelope with sharp backward-curving horns
antelope: graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks

sable antelope (noun)	antelope (noun)
large black East African antelope with sharp backward-curving horns	graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks