Moby thesaurus: affair, article, artifact, dingus, dofunny, dojigger, dojiggy, domajig, domajigger, doodad, dowhacky, eppes, etwas, flumadiddle, gadget, gigamaree, gimmick, gizmo, hickey, hootenanny, hootmalalie, jigger, material thing, object, quelque chose, something, thing, thingum, thingumabob, thingumadad, thingumadoodle, thingumajig, thingumajigger, thingumaree, thingummy, whatchy, widget ... show more.
Find more on dohickey elsewhere: etymology - rhymes - Wikipedia.
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