A specialist is someone who specializes (Studies) a very specific subject
eg: a specialist in neurology is a Doctor Who specializes in studying/fixing brains
A professional is anyone who do what they do for a living
eg: a professional footballer is a football player who gets money for playing football
So both are two different things, and usually a specialist is a professional, ie, he gets money for what he does.
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The specialist a person who is expert on the specific areas of study.
Professional is a person who has knowledge about the subject matter.