oryx vs antelope

oryx and antelope both are nouns.

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

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

oryx: large African antelope with long straight nearly upright horns
antelope: graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks

oryx (noun)	antelope (noun)
large African antelope with long straight nearly upright horns	graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks