Gopher turtle and Tortoise

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

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

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

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