hartebeest vs antelope

hartebeest and antelope both are nouns.

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

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

hartebeest: a large African antelope with lyre-shaped horns that curve backward
antelope: graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks

hartebeest (noun)	antelope (noun)
a large African antelope with lyre-shaped horns that curve backward	graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks