This is the 8762nd most frequent Polish word.
rosjanka
A Russian woman.
Subject of the sentence, indicating nationality.
Rosjanka mieszka w Moskwie.
The Russian woman lives in Moscow.
Object of the sentence, referring to a specific person encountered.
Spotkaliśmy Rosjankę na konferencji.
We met a Russian woman at the conference.
Refers to a specific person providing information.