Thingumbob is a term used to refer to any small device or object that has a specific purpose. The five crossword solutions for this term are GIZMO (5 letters), Rigamajig (9 letters), GISMO (5 letters), DOODAD (6 letters), and GADGET (6 letters). All of these words refer to a small device or object that is used for a particular purpose. GIZMO and GISMO are often used to refer to a device that is used for a specific purpose, such as a tool or machine. Rigamajig is a term used to describe a complex device or contraption that is made up of many different parts. DOODAD and GADGET are terms used to refer to any small device or object that is used for a particular purpose.