| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| English |
| English | nyctophobia | fear of night/darkness | n | AHD LRC |
| English | Kristallnacht | Night of Broken Glass: Nazi anti-Jewish pogrom | prop.n | AHD LRC |
| English | nightmare | incubus, evil spirit that oppresses during sleep | n | AHD CDC LRC |
| English | denigrate | to defame, cast aspersions on | vb.trans | AHD W7 LRC |
| English | equinox | when day and night are equally long | n | AHD W7 LRC |
| English | fortnight | period of 2 weeks, lit. 14 nights | n | AHD W7 LRC |
| English | negro | person of black ethnicity | n.arch | AHD LRC |
| English | niello | deep black metal alloy: sulfur with silver/copper/lead | n | AHD W7 LRC |
| English | nigella | (wild) fennel | n | AHD LRC |
| English | night | dusk-to-dawn period when no sunlight is visible | n | AHD W7 LRC |
| English | nigrescence | process of becoming dark/black | n | AHD W7 LRC |
| English | nigrescent | blackish | adj | W7 LRC |
| English | nigrosine | azine dyes related to indulines | n | AHD W7 LRC |
| English | noct(i)- | night | pfx | AHD LRC |
| English | nocto- | night | pfx | W7 LRC |
| English | noctuid | night-flying moth | n | AHD LRC |
| English | noctule | reddish-brown insectivorous bat | n | AHD LRC |
| English | nocturn | principal division of office of matins | n | AHD W7 LRC |
| English | nocturnal | re: night | adj | AHD W7 LRC |
| English | nyctalopia | night blindness | n | AHD LRC |
| English | nyctitropism | tendency of plant leaves to change position at nightfall | n | AHD LRC |
| English | streptonigrin | highly toxic antibiotic for tumors | n | AHD LRC |
| Old English | niht, næht, næct, neht, nyht | night | n.fem | ASD LRC |
| Old English | niht-scū(w)a | night's cover | n.masc | ASD LRC |
| Old English | niht-waco | night-watch | n.fem | LRC |
| Middle English | equinox | equinox | n | W7 LRC |
| Middle English | fourtenight | fortnight | n | W7 LRC |
| Middle English | night | night | n | W7 LRC |
| Middle English | nocturne | nocturn | n | W7 LRC |
| West Germanic |
| German | Kristallnacht | Kristallnacht, lit. crystal night | prop.n.fem | AHD LRC |
| German | Nachtmahr | nightmare | n.masc | IEW LRC |
| Old High German | naht | night | n | W7 LRC |
| German | Nacht | night | n.fem | LRC |
| German | Weihnachten | Christmas, lit. holy nights | n.neut | LRC |
| Old Frisian | nacht | night | n | ASD LRC |
| Dutch | nacht | night | n | LRC |
| Old Saxon | naht | night | n | ASD LRC |
| North Germanic |
| Old Norse | nótt | night | n.fem | LRC |
| Icelandic | nātt, nōtt | night | n | ASD LRC |
| Danish | nat | night | n | LRC |
| Swedish | natt | night | n | LRC |
| East Germanic |
| Gothic | nahts | night | n.wk.fem | LRC |
| Italic |
| Latin | aequinoctium | equinox | n.neut | W7 LRC |
| Latin | denigro, denigrare, denigravi, denigratus | to denigrate | vb | W7 LRC |
| Latin | nigellus | blackish | adj | W7 LRC |
| Latin | niger | black | adj | W7 LRC |
| Latin | nigro, nigrare | to blacken | vb | W7 LRC |
| Latin | nocturnus | of the night | adj | W7 LRC |
| Latin | nox, noctis | night | n.fem | LRC |
| Late Latin | nocturnalis | of the night | adj | W7 LRC |
| Medieval Latin | equinoxium | equinox | n.neut | W7 LRC |
| Portuguese | negro | black | adj | TLL AHD LRC |
| Portuguese | noite | night | n | TLL LRC |
| Spanish | negro | black | adj | TLL AHD LRC |
| Spanish | noche | night | n | TLL LRC |
| Middle French | equinoxe | equinox | n.fem | W7 LRC |
| Middle French | nocturne | of the night | adj | W7 LRC |
| French | noir | black | adj | TLL AHD LRC |
| French | nuit | night | n | TLL LRC |
| Italian | nero | black | adj | TLL AHD LRC |
| Italian | nièllo | niello, inlaid enamelwork | n.masc | W7 CID LRC |
| Italian | notte | night | n | TLL LRC |
| Balto-Slavic |
| Lithuanian | naktìs | night | n.fem | LRC |
| Latvian | nakts | night | n.fem | LRC |
| Old Church Slavonic | noštь | night | n.fem | LRC |
| Old Church Slavonic | noštьnъ | nocturnal | adj | LRC |
| Paleo-Balkan |
| Albanian | natë | night | n.fem | IEW LRC |
| Hellenic |
| Greek | νύκτωρ | by night | adv | LRC |
| Greek | νύξ, νύκτος | night | n.fem | LRC |