Jet-black and Pitch-black

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

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

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

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