This is the 35th most frequent Azerbaijani word.
rusiya
Russia
'Rusiya' is used here as a proper noun referring to the country of Russia.
Rusiya dünyanın ən böyük ölkəsidir.
Russia is the largest country in the world.
'Rusiya' in 'Rusiyada' is used with the locative case suffix to indicate location (in Russia).
Sən Rusiyada təhsil almaq istəyirsən?
Do you want to study in Russia?
'Rusiya' is used as the grammatical subject of the sentence in its nominative case referring to the country of Russia.