gizmo

Noun

• a device or control that is very useful for a particular job

• something unspecified whose name is either forgotten or not known
  • she eased the ball-shaped doodad back into its socket
    
  • there may be some great new gizmo around the corner that you will want to use
    

Related words

• Synonyms: 
  appliance , contraption , contrivance , convenience , gadget , gismo , widget , doodad , doohickey , doojigger , gimmick , gubbins , thingamabob , thingumabob , thingmabob , thingamajig , thingumajig