Gorilla gorilla vs great ape

Gorilla gorilla and great ape both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gorilla gorilla	Yes	No	No	No
great ape	Yes	No	No	No

As nouns, great ape is a hypernym of Gorilla gorilla; that is, great ape is a word with a broader meaning than Gorilla gorilla:

Gorilla gorilla: largest anthropoid ape; terrestrial and vegetarian; of forests of central west Africa
great ape: any of the large anthropoid apes of the family Pongidae

Other hypernyms of Gorilla gorilla include pongid.

Gorilla gorilla (noun)	great ape (noun)
largest anthropoid ape; terrestrial and vegetarian; of forests of central west Africa	any of the large anthropoid apes of the family Pongidae