This is the 14133rd most frequent Russian word.
оперная
The Russian word "оперная" means "opera" or "related to opera" in English.
Here, 'оперная' modifies 'постановка' (production) to specify it as related to opera, functioning as an adjective.
Я купила билеты на оперную постановку в театре.
I bought tickets for the opera production at the theater.
In this sentence, 'оперной' modifies 'певицы' (singer) to describe the profession related to opera, again as an adjective.
Её голос как у настоящей оперной певицы.
Her voice resembles that of a real opera singer.
Here, 'оперная' describes 'студия' (studio), indicating it as associated with opera, used as an adjective.