Daylight and Half-light

Daylight noun - The first appearance of light in the morning or the time of its appearance.

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

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

Daylight and half-light are semantically related in daybreak topic. Sometimes you can use "Daylight" instead a noun phrase "Half-light".