This is the 7924th most frequent Russian word.
кировском
"Kировском" refers to something related to Kirov, a city or region in Russia.
Here, 'кировском' is the prepositional case of 'Кировский', used as a proper adjective to describe the district name, coordinated with the noun 'районе'.
Я недавно был в Кировском районе города.
I recently visited the Kirov district of the city.
Here, 'Кировском' is the prepositional case of 'Кировский', referring to a theater named after a notable figure or place, working as a descriptive adjective in agreement with 'театре'.
В Кировском театре я видел прекрасный спектакль.
At the Kirov Theater, I watched a wonderful play.
Here, 'Кировскому' is in the dative case, paired with 'по' to indicate a location associated with the boulevard named 'Кировский', functioning as an adjective for 'бульвару'.