Midnight and Pitch-dark

Midnight noun - 12 o'clock at night; the middle of the night.

Pitch-dark and midnight are semantically related In some cases you can use "Pitch-dark" instead an adjective "Midnight".

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

Midnight and pitch-dark are semantically related in black topic. You can use "Midnight" instead the phrase "Pitch-dark" as an adjective or a noun.