Taurotragus oryx vs eland

Taurotragus oryx and eland both are nouns.

Word	Noun	Adjective	Verb	Adverb
Taurotragus oryx	Yes	No	No	No
eland	Yes	No	No	No

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

Taurotragus oryx: dark fawn-colored eland of southern and eastern Africa
eland: either of two large African antelopes of the genus Taurotragus having short spirally twisted horns in both sexes

Taurotragus oryx (noun)	eland (noun)
dark fawn-colored eland of southern and eastern Africa	either of two large African antelopes of the genus Taurotragus having short spirally twisted horns in both sexes