Synonyms of the word

nighttime

• n. The hours of darkness between sunset and sunrise; the night.
• adj. Pertaining to nighttime; appropriate to the night.
• adj. Happening during the night.

dark

• adj. Having an absolute or (more often) relative lack of light.
• adj. (of colour) Dull or deeper in hue; not bright or light.
• adj. Hidden, secret, obscure.
• adj. Without moral or spiritual light; sinister, malign.
• adj. Conducive to hopelessness; depressing or bleak.
• adj. Lacking progress in science or the arts; said of a time period.
• adj. With emphasis placed on the unpleasant aspects of life; said of a work of fiction, a work of nonfiction…
• n. A complete or (more often) partial absence of light.
• n. (uncountable) Ignorance.
• n. (uncountable) Nightfall.
• n. A dark shade or dark passage in a painting, engraving, etc.

night

• n. (countable) The period between sunset and sunrise, when a location faces far away from the sun, thus when…
• n. (countable) An evening or night spent at a particular activity.
• n. (countable) A night (and part of the days before and after it) spent in a hotel or other accommodation.
• n. (uncountable) Nightfall.
• n. (uncountable) Darkness.
• n. (uncountable) A dark blue colour, midnight blue.
• n. (sports, colloquial) A night's worth of competitions, generally one game.
• interj. Short for good night.
• v. To spend a night (in a place), to overnight.

period

• adj. Appropriate for a given historical era.
• adj. (of a film, or play, or similar) Set in and designed to evoke a particular historical period, especially…
• interj. (chiefly Canada, US) And nothing else; and nothing less; used for emphasis.
• n. A length of time.
• n. A period of time in history seen as a single coherent entity; an epoch, era.
• n. (now chiefly Canada, US) The punctuation mark “.” (indicating the ending of a sentence or marking an abbreviation).
• n. The length of time during which the same characteristics of a periodic phenomenon recur, such as the repetition…
• n. Female menstruation.
• n. A section of an artist's, writer's (etc.) career distinguished by a given quality, preoccupation etc.
• n. Each of the divisions into which a school day is split, allocated to a given subject or activity.
• n. (chiefly Canada, US) Each of the intervals into which various sporting events are divided.
• n. (obsolete, medicine) The length of time for a disease to run its course.
• n. An end or conclusion; the final point of a process etc.
• n. (rhetoric) A complete sentence, especially one expressing a single thought or making a balanced, rhythmic…
• n. (obsolete) A specific moment during a given process; a point, a stage.
• n. (chemistry) A row in the periodic table of the elements.
• n. (geology) A subdivision of an era, typically lasting from tens to hundreds of millions of years, see Appendix:…
• n. (genetics) A Drosophila gene which gene product is involved in regulation of the circadian rhythm.
• n. (music) Two phrases (an antecedent and a consequent phrase).
• n. (mathematics) One of several similar sets of figures or terms usually marked by points or commas placed…
• v. (obsolete, intransitive) To come to a period; to conclude.
• v. (obsolete, transitive, rare) To put an end to.