GISMO

A device that very useful for a particular job

• Contraption

• Contraption thingy

• Doodad

• Doohickey

• Doohickey: Var.

• Gadget

• Gadget for smog, I gather

• Gadget: Var.

• Gremlins pet

• Novelty: Var.

• Thingamabob

• Thingamabob (Var.)

• Thingamajig

• Thingamajig (Var.)

• Thingamajig's other spelling

• Thingy

• Whatchamacallit

• Whatchamacallit: Var.

• Something whose name is either forgotten or not known