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Synonyms for Widget (same or very similar meaning)

WordNet sense 1 (something unspecified whose name is either forgotten or not known):
doodad, doohickey, gimmick, gismo, gizmo, thingamabob, thingamajig, whatchamacallit, gubbins, thingmabob, thingmajig, thingumabob, thingumajig, thingummy, whatsis, doojigger, whatchamacallum

WordNet sense 2 (a device or control that is very useful for a particular job):
appliance, contraption, contrivance, convenience, gadget

From the ODE community, based on WordNetadd/edit