Coal-black and Coal black

Coal-black adjective - Of the blackest black; similar to the color of jet or coal.

Coal black and coal-black are semantically related In some cases you can replace phrase "Coal black" with "Coal-black", this phrases are similar.

Coal black noun - A very dark black.

Coal-black and coal black are semantically related in black topic. You can use "Coal-black" instead an adjective phrase "Coal black".