[n] a device that very useful for a particular job
appliance, contraption, contrivance, convenience, gismo, gizmo, widget
affair, apparatus, appliance, article, artifact, business, concern, contraption, contrivance, creation, device, dingus, dofunny, dohickey, dojigger, dojiggy, domajig, domajigger, doodad, dowhacky, eppes, etwas, flumadiddle, gigamaree, gimcrack, gimmick, g