night

[1]	(Stygian/Cimmerian) dark/darkness/blackness/gloom , nighttime , dark , night-time , shades of night , (Formal) tenebrosity/tenebrousness/tenebriousness
[2]	nightfall , gloaming , twilight , dusk , eventide , evening , evensong , edge of night , sunset , sundown , end of day , vespers
[3]	night and day , all the time , continually , incessantly , unceasingly , continuously , unendingly , endlessly , round-the-clock , ceaselessly , non-stop
[4]	Nox