The TERM 'whatchamacallit' is a colloquialism used to refer to an object or concept whose name one cannot remember. The crossword solutions for this TERM include NOUN (4 letters), THINGAMABOB (11 letters), GIZMO (5 letters), DOOHICKEY (9 letters), DOODAD (6 letters), GISMO (5 letters), TERM (4 letters), and THINGUMMY (9 letters). All of these terms are used to describe an object or concept whose name one cannot remember, and they are all interchangeable with the TERM 'whatchamacallit'.