Dusk vs. Nightfall

Dusknoun

A period of time at the end of day when the sun is below the horizon but before the full onset of night, especially the darker part of twilight.

Nightfallnoun

The close of the day; the coming of night.

Dusknoun

A darkish colour.

Nightfallnoun

The close of the day; the arrival of the night; the period at and just after dusk.

Duskverb

(intransitive) To begin to lose light or whiteness; to grow dusk.

Nightfallnoun

the time of day immediately following sunset;

‘he loved the twilight’; ‘they finished before the fall of night’;

Duskverb

(transitive) To make dusk.

Duskadjective

Tending to darkness or blackness; moderately dark or black; dusky.

Duskadjective

Tending to darkness or blackness; moderately dark or black; dusky.

‘A pathless desert, dusk with horrid shades.’;

Dusknoun

Imperfect obscurity; a middle degree between light and darkness; twilight; as, the dusk of the evening.

Dusknoun

A darkish color.

‘Whose duck set off the whiteness of the skin.’;

Duskverb

To make dusk.

‘After the sun is up, that shadow which dusketh the light of the moon must needs be under the earth.’;

Duskverb

To grow dusk.

Dusknoun

the time of day immediately following sunset;

‘he loved the twilight’; ‘they finished before the fall of night’;

Dusk

Dusk occurs at the darkest stage of twilight, or at the very end of astronomical twilight after sunset and just before night. At predusk, during early to intermediate stages of twilight, enough light in the sky under clear conditions may occur to read outdoors without artificial illumination; however, at the end of civil twilight (when Earth rotates to a point at which the center of the Sun's disk is 6° below the local horizon), such lighting is required to read outside.