Night
Part of speech: noun
Definition: The period between sunset and sunrise, when a location faces far away from the sun, thus when the sky is dark. An evening or night spent at a particular activity. A night (and part of the days before and after it) spent in a hotel or other accommodation. The quality of sleep obtained during a night. Nightfall. Darkness.
Part of speech: interjection
Definition: Short for good night
Example sentence: All men dream, but not equally. Those who dream by night in the dusty recesses of their minds, wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act on their dreams with open eyes, to make them possible.
Dark
Part of speech: noun
Definition: A complete or (more often) partial absence of light.Ignorance.Nightfall.
Part of speech: adjective
Definition: Having an absolute or (more often) relative lack of light.Dull or deeper in hue; not bright or light.Hidden, secretWithout moral or spiritual light; sinister, malign.Conducive to hopelessness; depressing or bleakLacking progress in science or the arts; said of a time periodWith emphasis placed on the unpleasant aspects of life; said of a work of fiction, a work of nonfiction presented in narrative form or a portion of either
Example sentence: Weather forecast for tonight: dark.