businessman
Pawnbrokernoun: A person who lends money at interest on the security of an article pawned.
A person with an exceptional skill is a master.
A person who deals in stolen goods is commonly referred to as a fence. Fences typically act as intermediaries between thieves and buyers, selling stolen goods for a profit.
philanthropist
You call them 'The person I owe money to'
An auctioner. As in, a person who works at an Auction.
umm by phone or if the question is meant to be (waht do you call a person with a lot of money) that answer is rich
We might call it purchasing power, or wealth. In general, people who have money can buy goods.
Poor
comover
Debtor.
spendthrift