1.
specialist, expert
A person who has special knowledge or skill in a particular field.
Related Words
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専門 (specialty)
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エキスパート (expert)
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プロ (pro, professional)
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熟練者 (skilled person, veteran)
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政治家 (politician)
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小説家 (novelist)
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音楽家 (musician)
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素人 (amateur, layperson)
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専門知識 (expertise)