noun
Refers to a person who appears on stage, in a film, on TV, or in a similar performance. Can be used for both professional and amateur contexts.
この映画の出演者はとても豪華だ。
The cast of this movie is very impressive.
彼女は舞台の出演者として有名になった。
She became famous as a stage performer.
キャスト is a loanword often used for the entire cast of a production, whereas 出演者 can refer to an individual performer or the collective cast.
Compound of 出演 (appearance, performance) + 者 (person). The reading is standard on'yomi.