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specialist. n. 1. a. a person who specializes in or devotes himself to a particular area of activity, field of research, etc. b. (as modifier): specialist knowledge.
An expert, more generally, is a person with extensive knowledge or ability based on research, experience, or occupation and in a particular area of study. Experts are called in for advice on their respective subject, but they do not always agree on the particulars of a field of study.