is a specific kind of: mechanism.

is a broader term that covers: broadcaster, spreader | bumper | bumper guard | carburetor, carburettor | compressor | copyholder | coupler, coupling | crimper, curler, hair curler, roller | diaphragm, stop | dicer | electromechanical device | escapement | gear lever, gearshift, gearstick, shifter | grab | claw, hook | machine, simple machine | pantograph | piston, plunger | propeller, propellor | pump | rachet, ratch, ratchet | auto-changer, changer, record changer | ride | seeder | shutter | binding, ski binding | splicer | splint | sprinkler | stator, stator coil | stoker | stretcher | striker | supply chamber | swing | pickup, pickup arm, tone arm | trap | vibrator | vibrator | voting machine | vane, weather vane, weathervane, wind vane | wheelwork | winder | key, winder | windscreen wiper, windshield wiper, wiper, wiper blade ... show more.