The young scientist became a Nobel prizewinner for his groundbreaking discovery.

prizewinner 是由 prize（奖项）和 winner（获胜者）组成的复合名词，字面意思是"奖项获得者"，在这里特指"诺贝尔奖得主"。 prize 指"奖项、奖品"，winner 指"获胜者、赢家"，两者组合起来表示"获奖者"。