Sundown vs. Nightfall — What's the Difference?

The time in the evening when the sun disappears or daylight fades.

The approach of darkness; dusk.

The time of sunset.

The close of the day; the coming of night.

(US) Sunset.

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

(countable) A hat with a wide brim to shade the eyes from sunlight.

The time of day immediately following sunset;

To experience an episode or an onset of some detrimental mental condition like agitation, anxiety, hallucination or dementia, daily at nightfall.

The setting of the sun; sunset.

A kind of broad-brimmed sun hat worn by women.

The time in the evening at which the sun begins to fall below the horizon