Aphotic and Pitch-black

Aphotic adjective - Lacking light; especially not reached by sunlight.

Pitch-black and aphotic are semantically related. in lack of light topic. In some cases you can use "Pitch-black" instead an adjective "Aphotic".

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

Aphotic and pitch-black are semantically related. Sometimes you can use "Aphotic" instead an adjective phrase "Pitch-black".