This is the 12715th most frequent Russian word.
котла
"Котла" is the genitive singular or accusative plural form of "котёл," meaning "boiler" or "cauldron."
In this sentence, "котла" refers to a boiler, specifically using its genitive case form.
Мы посмотрели на старый котла и решили его починить.
We looked at the old boiler and decided to fix it.
Here, "котла" denotes a cauldron or pot, again in genitive case to indicate possession.
Крышка от котла была потеряна несколько дней назад.
The lid of the cauldron was lost a few days ago.
The word "котла" in this sentence specifies a boiler, using the genitive case to associate 'sound' with 'boiler'.