This is the 259th most frequent Russian word.
оружия
"Оружия" translates to "weapons" or "arms" in English.
The word 'оружия' is used in its genitive singular form here, referring to the possession or amount of weaponry.
У солдат было много оружия.
The soldiers had a lot of weapons.
In this sentence, 'оружия' remains in genitive singular, as it's part of the phrase referring to possession or association with 'коллекция' (collection).
Он осмотрел коллекцию оружия в музее.
He examined the collection of weapons in the museum.
Here, 'оружия' is in genitive singular, indicating the type of permits required, specifically those for 'оружие' (weaponry).