Translation guide
A person with deep knowledge or skill in a particular area. In Japanese, the most common equivalent is 専門家 (senmonka), but other terms like スペシャリスト (supesharisuto) or 専門医 (senmon'i) for medical specialists are used depending on context.
Referring to someone with specialized knowledge or expertise in any professional or academic area.
A doctor who specializes in a particular branch of medicine.
Emphasizing narrow focus or specialization, often in contrast to a generalist.
専門家 is the safest, most neutral choice. スペシャリスト is a loanword often used in business or casual talk. エキスパート implies top-level expertise and is common in formal or written contexts.
He is a specialist.
He is a specialist (casual).
He is an expert.
Loanword from English, often used in business or technical contexts. Slightly more casual than 専門家.
She is a marketing specialist.
Another loanword, emphasizing high-level expertise. Often used in professional settings.
He is known as a cybersecurity expert.
You need a referral to a specialist.
Can also be used for medical specialists, but 専門医 is more precise.
He is a heart specialist.
We develop specialized personnel.