brown hyena vs hyena

brown hyena and hyena both are nouns.

Word	Noun	Adjective	Verb	Adverb
brown hyena	Yes	No	No	No
hyena	Yes	No	No	No

As nouns, hyena is a hypernym of brown hyena; that is, hyena is a word with a broader meaning than brown hyena:

brown hyena: of southern Africa
hyena: doglike nocturnal mammal of Africa and southern Asia that feeds chiefly on carrion

Other hypernyms of brown hyena include hyaena.

brown hyena (noun)	hyena (noun)
of southern Africa	doglike nocturnal mammal of Africa and southern Asia that feeds chiefly on carrion