The term 'temporary replacement' can be summarized as a loaner, which is a six-letter word. A loaner is someone or something that is temporarily given to replace something else. This could be a person who is hired to fill in for an employee who is on leave, or it could be a piece of equipment that is borrowed to replace a broken one. In either case, the loaner is only intended to be a temporary solution until the original item or person is available again.