prosperous, rich, wealthy
powerful, prominent, successful
foreign, local
builders' (BrE), coal (esp. BrE), timber, wine, wool, etc.
We bought a ton of sand from the builders' merchant.

fleet, marine (AmE), navy (BrE), seaman, ship, shipping, vessel

Merchant is used with these nouns:
banking, class, cruiser, fleet, navy, sailor, ship, vessel