nights

The word “nights” means during the night, especially on a regular or recurring basis. In plain terms, regularly at night, especially describing work shifts.

“Nights” is pronounced nyts (/naɪts/ in IPA).

Here is “nights” used in a sentence: “He works nights at the hospital.”

“Nights” is an adverb.

The word “nights” comes from Old English. From Old English nihtes, an old adverbial form of "night" meaning "by night.".

“Nights” is a fairly common word in modern English.

It means working during the night on a regular basis, rather than on a single occasion. Someone who works nights does their shifts after dark — for example from evening until morning — as their usual pattern. The "-s" ending signals a repeated, habitual arrangement, not a one-off.

"At night" simply says when something happens and can be a single instance. "Nights" as an adverb implies a habit or routine — "she reads nights" suggests she does so regularly. The plural-looking form carries the sense of something recurring rather than a one-time event.

Yes. Although it looks like a plural noun, in phrases like "he works nights" it functions as an adverb of time, describing when the action happens. This is an old English pattern called the adverbial genitive, the same one behind words such as "always" and "sideways."