gismo

noun

1

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

Synonym: appliance contraption contrivance convenience gadget gizmo widget

2

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

Synonym: doodad doohickey doojigger gimmick gizmo gubbins thingamabob thingumabob thingmabob thingamajig thingumajig thingmajig thingummy whatchamacallit whatchamacallum whatsis widget