The only word in the English language with three double letters in consecutive order.

Job profession that deals with the keeping track of money.

One who keeps track of money holdings, transactions, gains, losses and otherwise anything to do with moolah.
Commonly thought as criminals who only record bets and work for no-goods, they are actually quite a resourceful part of society who handle everything from taxes to personal banking accounts to corporate earnings. They are, if you haven't noticed, generally associated with finances.

A sub-bookkeeper is the only word with four double letters together.