Jet black and Pitch-dark

Jet black noun - A very dark black.

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. Sometimes you can use "Jet black" instead an adjective phrase "Pitch-dark".