Eventide and Half-light

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

Half-light and eventide are semantically related In some cases you can use "Half-light" instead a noun "Eventide".

Half-light noun - A greyish light (as at dawn or dusk or in dim interiors).

Eventide and half-light are semantically related in onset of darkness at end of day topic. You can use "Eventide" instead a noun phrase "Half-light".