This is the 6762nd most frequent French word.
koursk
"Koursk" is not a French word; it refers to a city in Russia or the submarine "Kursk."
In this sentence, 'Koursk' refers to the Russian submarine known for its tragic sinking in 2000.
Le Koursk était un sous-marin russe célèbre.
The Kursk was a famous Russian submarine.
Here, 'Koursk' refers to a geographic location, specifically a city in Russia.
Koursk est aussi le nom d'une ville en Russie.
Kursk is also the name of a city in Russia.
In this case, 'Koursk' is used as the title of a cinematic work discussing the submarine's tragedy.