Commercial traveler and Knight of the road

Commercial traveler noun - A salesman who travels to call on customers.

Knight of the road and commercial traveler are semantically related in traveling salesperson topic. In some cases you can use "Knight of the road" instead a noun phrase "Commercial traveler".

Commercial traveler and knight of the road are semantically related in traveling agent topic. You can use "Commercial traveler" instead a noun phrase "Knight of the road", if it concerns topics such as worker who travels a lot.