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The Japanese word

主役

is pronounced
shuyaku | しゅやく
means
leading part, leading actor (actress)
Examples:
私の妹が主役を演じた。
watashi no imōto ga juyaku o enji ta.
My sister played the leading character.
ボブは今度の学園祭で初めて主役を演じる。
bobu wa kondo no gakuen sai de hajimete juyaku o enjiru.
Bob will play the leading role for the first time in the next school festival.
次の文化祭で初めて主役を演じることになっています。
tsugi no bunka sai de hajimete juyaku o enjiru koto ni natte i masu.
He will play the leading role for the first time in the next school festival.
Examples sourced from tatoeba.org