Collocations for trader - noun

large
China is now one of the largest traders in the world.

free
small, small-scale
small market traders

local
foreign, international
wealthy
market, street
itinerant
sole (BrE)
You can set up in business as a sole trader, in partnership or as a limited company.

independent, private (both esp. BrE)
professional
retail
cattle, fur, motor (BrE), slave, etc.
commodity, currency, futures, options
floor (in a stock exchange)