nightfall

• POS: Noun
• HYPHEN: night=fall

CIDE DICTIONARY

nightfall, n. 

 The close of the day; the arrival of the night; the period at and just after dusk.  Swift.  [1913 Webster]

OXFORD DICTIONARY

nightfall, n. the onset of night; the end of daylight.

ROGET THESAURUS

nightfall

Evening

N evening, eve, decline of day, fall of day, close of day, candlelight, candlelighting, eventide, nightfall, curfew, dusk, twilight, eleventh hour, sunset, sundown, going down of the sun, cock-shut, dewy eve, gloaming, bedtime, afternoon, postmeridian, p, m, autumn, fall, fall of the leaf, autumnal equinox, Indian summer, St. Luke's summer, St. Martin's summer, midnight, dead of night, witching hour, witching hour of night, witching time of night, winter, killing time, vespertine, autumnal, nocturnal, midnight, the outpost of advancing day, sable-vested Night, this gorgeous arch with golden worlds inlay'd.