This is the 8846th most frequent Turkish word.
sonbaharın
"Sonbaharın" means "of autumn" or "of fall" in English.
Here, 'sonbaharın' is in the genitive case, explaining possession or association to 'colors'.
Sonbaharın renkleri ormana büyüleyici bir güzellik katar.
The colors of autumn add a mesmerizing beauty to the forest.
In this sentence, 'sonbaharın' again is in the genitive case, indicating association with 'arrival'.
Sonbaharın gelmesiyle havalar serinlemeye başladı.
With the arrival of autumn, the weather started to cool down.
Here, 'sonbaharın' denotes possession, specifying that the beauties belong to autumn.