Coal black and Pitch-dark

Coal black noun - A very dark black.

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. Sometimes you can replace phrase "Coal black" with "Pitch-dark", this phrases are similar.