The term 'doohickey' is a colloquialism used to refer to an object whose name is unknown or forgotten. It is often used as a catch-all term for any small, seemingly insignificant ITEM. Other words that are similar in meaning to 'doohickey' include 'DINGUS' (6 letters), 'THINGAMABOB' (11 letters), 'THINGUMABOB' (11 letters), 'DOODAD' (6 letters), 'ITEM' (4 letters), 'GISMO' (5 letters), 'THINGAMAJIG' (11 letters), 'THING' (5 letters), 'GIZMO' (5 letters), 'GADGET' (6 letters), 'WHATSIS' (7 letters), 'WHATSIT' (7 letters), and 'THINGUMMY' (9 letters). All of these words can be used to describe an object whose name is unknown or forgotten.