This is the 750th most frequent Hebrew word.
לילה
Night.
Here, 'לילה' represents the nighttime as a period of the day.
הלילה הוא שקט ורגוע.
The night is calm and serene.
In this usage, 'לילה' denotes the duration of one night.
אנחנו נשארים לילה במלון הזה.
We are staying one night at this hotel.
This usage of 'לילה' emphasizes the period of darkness within the day which illuminates the context of the action described.