gismo

(n) 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
doodad, doohickey, doojigger, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingmajig, thingumabob, thingumajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget, gimmick,
(n) a device or control that is very useful for a particular job appliance, contraption, contrivance, gadget, gizmo, widget, convenience,

doodad doohickey doojigger gizmo gubbins thingamabob thingamajig thingmabob thingmajig thingumabob thingumajig thingummy whatchamacallit whatchamacallum whatsis widget gimmick appliance contraption contrivance gadget convenience

Gish gist