Gopherus polypemus vs tortoise

Gopherus polypemus and tortoise both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gopherus polypemus	Yes	No	No	No
tortoise	Yes	No	No	No

As nouns, tortoise is a hypernym of Gopherus polypemus; that is, tortoise is a word with a broader meaning than Gopherus polypemus:

Gopherus polypemus: burrowing edible land tortoise of southeastern North America
tortoise: usually herbivorous land turtles having clawed elephant-like limbs; worldwide in arid areas except Australia and Antarctica

Gopherus polypemus (noun)	tortoise (noun)
burrowing edible land tortoise of southeastern North America	usually herbivorous land turtles having clawed elephant-like limbs; worldwide in arid areas except Australia and Antarctica