This is the 69th most frequent Bulgarian word.
лева
The Bulgarian word "лева" (leva) is the plural form of "лев" (lev), the currency of Bulgaria.
Here, 'лева' is used as the plural of 'лев' to indicate the currency of Bulgaria in a monetary transaction.
Тази книга струва десет лева.
This book costs ten leva.
In this instance, 'лева' represents the plural form of the Bulgarian word for the unit of currency, used to describe a different quantity.
Преди година той ми даде два лева на заем.
A year ago, he lent me two leva.
Here, 'лева' appears in the context of an exchange involving the Bulgarian currency.