gismo
Noun
Meaning
a device or control that is very useful for a particular job
something unspecified whose name is either forgotten or not known
Source: WordNetSynonyms
gizmo
convenience
appliance
contrivance
gimmick
contraption
gubbins
gadget
doohickey
widget
doodad
doojigger
thingamajig
thingummy
thingamabob
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Examples
she eased the ball-shaped doodad back into its socket
there may be some great new gizmo around the corner that you will want to use