Green turtle and Marine turtle

Green turtle noun - Large tropical turtle with greenish flesh used for turtle soup.

Marine turtle and green turtle are semantically related. In some cases you can use "Marine turtle" instead a noun phrase "Green turtle".

Marine turtle noun - Any of various large turtles with limbs modified into flippers; widely distributed in warm seas.

Green turtle and marine turtle are semantically related. Sometimes you can replace phrase "Green turtle" with "Marine turtle", this phrases are similar.