Eventide and Pitch-dark

Eventide noun - The time from when the sun begins to set to the onset of total darkness.

Pitch-dark and eventide are semantically related. In some cases you can replace phrase "Pitch-dark" with "Eventide", this terms are similar.

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

Eventide and pitch-dark are semantically related. Sometimes you can use "Eventide" instead a noun phrase "Pitch-dark".