Equus africanus vs wild ass

Equus africanus and wild ass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Equus africanus	Yes	No	No	No
wild ass	Yes	No	No	No

As nouns, wild ass is a hypernym of Equus africanus; that is, wild ass is a word with a broader meaning than Equus africanus:

Equus africanus (noun)	wild ass (noun)
a wild ass of Africa	any of several equine mammals of Asia and northeast Africa