Operation
Part of speech: noun
Definition: The method by which a device performs its function. The method or practice by which actions are done. A planned undertaking. A business or organization. a surgical procedure. a procedure for generating a value from one or more other values (the operands; the value for any particular operands is unique) a military campaign (w:Operation Desert Storm)
Example sentence: When I told my doctor I couldn't afford an operation, he offered to touch-up my X-rays.
Functioning
Part of speech: adjective
Definition: working
Part of speech: noun
Definition: action of the verb to functionThe manner in something functions; the workings
Part of speech: verb
Definition: To have a function.