This is the 3490th most frequent Turkish word.
okullar
"Schools"
"Okullar" is plural and possessive (related to schools collectively, 'their opening day').
Okulların açılış günü yaklaşıyor.
The opening day of schools is approaching.
"Okullara" indicates direction towards the schools (dative case).
Çocuklar okullara heyecanla gidiyorlar.
Children are going to schools excitedly.
"Okullar" serves as the subject in plural form (general reference to schools as entities).