Pitch-black and Pitch black

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

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

Pitch black noun - A very dark black.

Pitch-black and pitch black are semantically related in black topic. You can use "Pitch-black" instead an adjective phrase "Pitch black", if it concerns topics such as sooty, lack of light, very dark in color.