The term CASH UNITS can be broken down into two crossword solutions: WADS (4 letters) and UNITS (5 letters). WADS is a slang term for money, usually referring to large amounts of cash. It is derived from the word 'WAD' which means a bundle of something, such as paper money. UNITS is a term used to refer to individual pieces of currency, such as coins or bills. Together, CASH UNITS refers to both large bundles of money and individual pieces of currency.