A record book is a useful tool for keeping track of important information. However, it is an old-fashioned term and there are several synonyms that can be used instead. A journal is a great alternative that is often used to write down personal thoughts, feelings and experiences. A logbook, on the other hand, is a record of events or activities that have been carried out, particularly in regulated industries like aviation or shipping. A ledger is a formal record of financial transactions and is used by businesses to keep track of their finances. A register is another term used to record specific data or information. Regardless of the term used, all these synonyms serve as an essential means of organizing and recording important information.