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"Night" is a noun which is often translated as "la noche", and "per day" is an adverb which is often translated as "por día". Learn more about the difference between "night" and "per day" below.
night(
nayt
)
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
noun
1. (time of day)
a. la noche
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(F)
I go to sleep at 11 pm every night.Me acuesto a las 11 pm todas las noches.
Should we spend the night, or try and drive back?No sé si deberíamos quedarnos la noche o tratar de volver.
2. (evening)
a. la noche
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(F)
The children aren't allowed to play outside at night.A los niños no les dejan jugar afuera por la noche.
3. (darkness)
a. la oscuridad de la noche
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(F)
The carriage disappeared into the night.El carruaje desapareció en la oscuridad de la noche.
An adjective is a word that describes a noun (e.g. the big dog).
adjective
4. (nocturnal)
a. nocturno
Our favorite night club is in the center of the city.Nuestro club nocturno favorito está en el centro de la ciudad.
b. de la noche
Bats are night creatures that rely on their hearing for perception.Los murciélagos son criaturas de la noche que dependen del oído para percibir sus alrededores.
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per day(
puhr
 
dey
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
adverb
1. (general)
a. por día
I brush my teeth two times per day.Yo me cepillo los dientes dos veces por día.
b. al día
In the summer, I shower twice per day.En verano, me ducho dos veces al día.
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