Mud turtle and Turtle

Mud turtle noun - Bottom-dwelling freshwater turtle inhabiting muddy rivers of North America and Central America.

Turtle and mud turtle are semantically related. In some cases you can use "Turtle" instead a noun phrase "Mud turtle".

Turtle noun - Any of various aquatic and land reptiles having a bony shell and flipper-like limbs for swimming.

Mud turtle and turtle are semantically related. Sometimes you can replace phrase "Mud turtle" with "Turtle", this terms are similar.