This is the 188th most frequent Czech word.
ráno
"Ráno" means "morning" in English.
In this sentence, 'ráno' is used as a noun referring to the time of the day, specifically 'morning'.
Každé ráno chodím na procházku.
Every morning I go for a walk.
Here, 'ráno' is used nominally to denote the early hours of the day.
Ráno je většinou klidné a tiché.
The morning is usually calm and quiet.
In this case, 'ráno' functions as an expression indicating a point in time during the day.