Gopher tortoise and Tortoise

Gopher tortoise noun - Burrowing edible land tortoise of southeastern North America.

Tortoise and gopher tortoise are semantically related. In some cases you can use "Tortoise" instead a noun phrase "Gopher tortoise".

Tortoise noun - Usually herbivorous land turtles having clawed elephant-like limbs; worldwide in arid area except Australia and Antarctica.

Gopher tortoise and tortoise are semantically related. Sometimes you can replace phrase "Gopher tortoise" with "Tortoise", this terms are similar.