A person who is experienced at a certain activity.
A person who earns their living from a specified activity
A person who belongs to a profession
A reputation known by name
A prostitute
An expert
One of four categories of sociologist propounded by Horowitz: a sociologist who is actively concerned with promoting the profession of sociology.
Expert.
Of, pertaining to, or in accordance with the (usually high) standards of a profession.
That is carried out for money, especially as a livelihood.