A quantity of money is a term used to describe a SUM of money, usually in the form of cash or coins. The term can be broken down into three parts: SUM (3 letters), WAD (3 letters), and AMOUNT (6 letters). SUM is a noun that refers to a total AMOUNT of money, while WAD is a noun that refers to a large bundle of paper money or coins. Lastly, AMOUNT is a noun that refers to a specific quantity of something, in this case money.