This is the 2420th most frequent Russian word.
пива
"Пива" means "beer" (genitive singular or nominative plural form in Russian).
Here, 'пива' is in the genitive case and is used to indicate the content of the bottle.
Я купил бутылку пива.
I bought a bottle of beer.
In this example, 'пива' again appears in the genitive case, commonly used when talking about unspecified quantities or types of beer.
Мы заказали пива в ресторане.
We ordered beer at the restaurant.
Here, 'пива' reflects absence and is in the genitive case, often used in phrases expressing negation.