Coal-black and Pitch-dark

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

Pitch-dark and coal-black are semantically related in black topic. In some cases you can use "Pitch-dark" instead an adjective phrase "Coal-black".

Pitch-dark adjective - Being without light or without much light.

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