The ability, either naturally, by technology or by superpowers, to see in a low light or even dark environment.

plural of night watchman

A bird active at night, sometimes identified with a specific species such as a night owl or nightjar, and sometimes seen as a separate animal in its own right.

Used other than figuratively or idiomatically: see work, nights. / (euphemistic) To work as a prostitute.

(colloquial, usually childish) Good night.

(colloquial, usually childish) Alternative spelling of nighty night

A creature which flies at night; a nocturnal flier or traveler. / (often attributive) One who departs or flees at night in order to avoid creditors, law enforcement etc.

Alternative spelling of nightlight

plural of night school

plural of thief in the night