consumer - a person who uses goods or services

buyer, emptor, purchaser, vendee - a person who buys

guest - a customer of a hotel or restaurant etc.

frequenter, patron - a regular customer

policyholder - an insured person; the client in whose name an insurance policy is written

shopper - someone who visits stores in search of articles to buy

disburser, expender, spender - someone who spends money to purchase goods or services

reader, subscriber - someone who contracts to receive and pay for a certain number of issues of a publication

taker - one who accepts an offer

warrantee - a customer to whom a warrant or guarantee is given

whoremaster, whoremonger, john - a prostitute's customer

business relation - a relation between different business enterprises