Synonyms and related words :
Egyptian darkness, Erebus, all the time, all-night, blackness, ceaselessly, charcoal, coal, continually, continuously, crow, dark, dark of night, darkness, darkness visible, dead of night, dusk, ebon, ebony, endlessly, evening, evensong, eventide, gloaming, incessantly, ink, intense darkness, jet, lightlessness, midnight, moonlessness, night and day, night-fallen, nightfall, nightlong, nightly, nighttide, nighttime, nocturnal, obscure, obscure darkness, obscurity, pitch, pitch-darkness, pitchy darkness, raven, round-the-clock, sable night, sloe, smoke, smut, soot, starlessness, sundown, sunlessness, sunset, swarthiness, tar, tenebrosity, tenebrousness, the palpable obscure, total darkness, twilight, unceasingly, unendingly, velvet darkness, vespers