The time of day between sunset and sunrise
Encoding Strategies:
linguistic
visual

nocturnal
active at night
Noche means night and is related to the English word nocturnal0, which describes animals that are active at night.
noche
night, evening (time of day)
The hours of darkness between sunset and sunrise.
No dormí en toda la nocheI didn't sleep all night
Vamos a cenar juntos esta nocheWe're having dinner together this evening
nightfall, dark (darkness)
The night as the moment darkness arrives, or the darkness itself.
Los murciélagos salen al caer la nocheThe bats come out at nightfall
Volvimos a casa antes de que se hiciera de nocheWe came home before it got dark