This is the 1791st most frequent Turkish word.
ağaçları
"Trees" (plural form, accusative or possessive case of "ağaç").
In this sentence, 'ağaçları' is in the accusative case, indicating it is the direct object of the verb 'görüyoruz' ('we are seeing').
Ormanda güzel ağaçları görüyoruz.
We are seeing beautiful trees in the forest.
Here, 'ağaçları' is again in the accusative case, describing the affected object of the action performed by the wind.
Rüzgar, ağaçları sertçe salladı.
The wind shook the trees harshly.
Once more, 'ağaçları' is in the accusative case, showing that it is the object of affection expressed by the speaker.