仕, 勤, and 働 all mean 'work', but 仕 emphasizes the job title, 働 emphasizes the physical labor on the job, and 勤 emphasizes 'to work AT such-and-such a company.'
Onyomi
DOU
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Homer says DOH as he schleps off to do his job.
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Mnemonic
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A person moves around as they do their job.
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Kunyomi
Jukugo
労働
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manual labor
★★★★☆
労 (labor) + 働 (to do your job)
= 労働 (manual labor)
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労働者
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laborer
★★☆☆☆
労働 (manual labor) + 者 (professional)
= 労働者 (laborer)
laborer. proletarian
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