Work and function are two words that are often used interchangeably, but they have different meanings. Work is defined as an activity involving mental or physical effort done in order to achieve a purpose or result. Function, on the other hand, is defined as the action for which a person or thing is specially fitted or used, or the purpose that something serves. The crossword solution for these two terms is 'OPERATE, ' which means to manage or control the functioning of something. This could refer to managing a business, controlling a machine, or running a program.