Pitch black and Stygian

Pitch black noun - A very dark black.

Stygian and pitch black are semantically related. in black topic. In some cases you can use "Stygian" instead an adjective phrase "Pitch black", when it comes to topics like lack of light.

Stygian adjective - Being without light or without much light.

Pitch black and stygian are semantically related. Sometimes you can replace phrase "Pitch black" with "Stygian", this terms are similar.