This is the 139th most frequent Spanish word.
noche
"Night."
Here, 'noche' refers to the time of the day between evening and morning, characterized by darkness outside.
La noche está estrellada.
The night is starry.
'Noche' in this sentence refers to a specific evening or night in which the described event will occur.
Vamos a una fiesta esta noche.
We are going to a party tonight.
In this usage, 'de noche' refers to the general time period of night as opposed to day.