This is the 155th most frequent Polish word.
wojny
"Wojny" means "wars" in English.
In this sentence, 'wojny' is used in the genitive singular case to indicate 'during the war'.
Podczas wojny ludzie musieli często ukrywać się przed wrogiem.
During the war, people often had to hide from the enemy.
In this sentence, 'wojnom' is the dative plural case, suggesting the prevention 'of wars'.
Zapobieganie wojnom jest istotnym celem polityki międzynarodowej.
Preventing wars is an important goal of international policy.
Here, 'wojnach' is used in the locative plural case to discuss 'wars' in a general reflective context.