salesperson
noun
she worked as a salesperson for a time:
salesman, saleswoman, sales assistant, assistant, shop assistant, saleslady, salesgirl, seller, negotiator, representative, sales representative, agent;
reseller, auctioneer, travelling salesperson/salesman/saleswoman, shopkeeper, trader, merchant, dealer, pedlar, hawker;
North American sales clerk;
informal counter-jumper, rep, knight of the road;
dated shop boy, shop girl, shopman, traveller, commercial traveller.
salesperson Oxford Dictionary of English