This is the 7111th most frequent Russian word.
болхов
"Болхов" is a proper noun referring to a town in the Oryol region of Russia.
Here, 'Болхов' is used as the name of a town, demonstrating its usage as a proper noun.
Мы посетили Болхов в рамках нашего путешествия по России.
We visited Bolkhov as part of our journey around Russia.
In this sentence, 'Болхов' is again used as a proper noun, referring specifically to a town and its historical context.
Книга рассказывает о истории города Болхов.
The book tells about the history of the town of Bolkhov.
Here, 'Болхова' is the genitive case form of 'Болхов', indicating possession or relationship to the town.