This is the 13851st most frequent Polish word.
policjê
"Policję" means "police" in English (accusative case).
The word 'policję' is used in the accusative singular form as it is the direct object of the verb 'zadzwoniłem' (I called).
Zadzwoniłem na policję, aby zgłosić wypadek.
I called the police to report an accident.
Here, 'policja' is in its nominative singular form as it is the subject of the sentence.
Na miejscu szybko pojawiła się policja.
The police quickly arrived at the scene.
Similarly to the previous example, 'policja' is in the nominative singular form because it serves as the subject of the verb 'znajdzie' (will find).