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A professional is someone who has devoted their life to learning and keeping up to date on a specific job.
You can act professionally, but it does not mean you are a professional.
Like a professional store clerk, or a professional construction worker, or a professional janitor - these are not valid uses of the word.
There is no great depth to these jobs, however well you may be able to perform them.
A professional stripper or bartender, now....
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