This is the 556th most frequent Russian word.
москва
"Москва" is "Moscow," the capital city of Russia.
It is used as a proper noun representing the city, serving as the subject of the sentence.
Москва — столица России.
Moscow is the capital of Russia.
Here, 'Москву' is the accusative case form of 'Москва', showing the direction of the action, indicating motion towards the city.
Я планирую посетить Москву в следующем году.
I plan to visit Moscow next year.
In this sentence, 'Москвы' is the genitive case form of 'Москва', describing possession or association, indicating 'of Moscow'.