Example : It sounds good but what's the catch?.

Synonyms : catch

Example : 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.

Synonyms : doodad, doohickey, doojigger, gismo, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingmajig, thingumabob, thingumajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget

Example : He would stoop to any device to win a point.
It was a great sales gimmick.
A cheap promotions gimmick for greedy businessmen.

Synonyms : device, twist