This is the 2136th most frequent Russian word.
актриса
Actress.
The word 'актрисой' is used in the instrumental case, indicating her role or aspiration.
Моя подруга мечтает стать известной актрисой.
My friend dreams of becoming a famous actress.
The word 'актрису' is in the accusative case, as it is the direct object of the verb 'знаете'.
Вы знаете эту актрису?
Do you know this actress?
The word 'актриса' is in the nominative case, as it is the subject of the sentence.