Nocturnal
Part of speech: adjective
Definition: Primarily active during the night. Taking place at night.
Example sentence: All architecture is great architecture after sunset; perhaps architecture is really a nocturnal art, like the art of fireworks.
Period
Part of speech: adjective
Definition: Appropriate for a given historical era.
Part of speech: interjection
Definition: And nothing else; and nothing less; used for emphasis.
Part of speech: noun
Definition: Punctuation mark “” (indicating the ending of a sentence or marking an abbreviation).A length of time.An epoch, era, time in history or in a person's life.A specific length of time that an activity (such as a game or a school day) is conventionally divided into.The minimum interval during which the same characteristics of a periodic phenomenon recur, such as the repetition of a wave or the rotation of a planet.Female menstruation.A row in the periodic table of the elements.A Drosophila gene which gene product is involved in regulation of the circadian rhythm