Related words 専門家 is the standard native Japanese word for a specialist and is used in formal writing, while エキスパート is a loanword with a more modern, international feel often used in business contexts.
達人 suggests a master who has attained great skill through long practice, often in traditional arts, whereas エキスパート focuses on professional or technical expertise.
プロ (short for プロフェッショナル ) emphasizes doing something as one's paid profession, while エキスパート emphasizes deep knowledge or skill regardless of pay.
エキスパート and スペシャリスト are both loanwords for an expert, but エキスパート leans toward practical skill while スペシャリスト leans toward specialized knowledge or role.
Written forms エキスパート Usage 99%
Standard katakana loanword spelling; the most common form.
エクスパート Usage 1%
Alternate katakana spelling reflecting a slightly different English pronunciation; less common but still encountered.
Etymology Loanword from English 'expert'.
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