Whatchamacallits, noun plural of whatchamacallit. Synonyms in the same form.
Gizmo
widgets, doodads, thingies, gimmicks, thingamajigs, thingumabobs, thingummies, thingmabobs, whatsises, thingumajigs, dojiggers, hickeys, dinguses, hootenannies, gizmos, doohickeys, thingamabobs
All synonyms for whatchamacallit →