hard worker; hardworking person
Describes a person who consistently puts in effort; often used admiringly.
彼女は努力家だから、きっと成功するよ。
She's a hard worker, so I'm sure she'll succeed.
努力家の彼は毎日遅くまで勉強している。
A hard worker, he studies until late every day.
働き者 focuses on actually working hard physically or practically, while 努力家 emphasizes persistent effort toward a goal, which may not involve manual labor.
努力家 is a noun describing a person known for making great effort, while 勤勉 is an adjective describing the quality of being industrious itself.
Compound of 努力 (effort) + 家 (suffix for a person with a certain characteristic).