Grey whale and Whalebone whale

Grey whale noun - Medium-sized greyish-black whale of the northern Pacific.

Whalebone whale and grey whale are semantically related. In some cases you can use "Whalebone whale" instead a noun phrase "Grey whale".

Whalebone whale noun - Whale with plates of whalebone along the upper jaw for filtering plankton from the water.

Grey whale and whalebone whale are semantically related. Sometimes you can replace phrase "Grey whale" with "Whalebone whale", this phrases are similar.