Jet-black and Pitch-dark

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

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

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

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