mechanical device vs roller

roller vs mechanical device

mechanical device and roller both are nouns.

Word	Noun	Adjective	Verb	Adverb
mechanical device	Yes	No	No	No
roller	Yes	No	No	No

As nouns, roller is a hyponym of mechanical device; that is, roller is a word with a more specific, narrower meaning than mechanical device:

mechanical device: mechanism consisting of a device that works on mechanical principles
roller: a mechanical device consisting of a cylindrical tube around which the hair is wound to curl it

Other hyponyms of mechanical device include broadcaster, spreader, bumper, bumper guard, carburetor, carburettor, compressor, copyholder, coupler, coupling, crimper, curler, hair curler, 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, durometer, page turner.

mechanical device (noun)	roller (noun)
mechanism consisting of a device that works on mechanical principles	a grounder that rolls along the infield
	Old World bird that tumbles or rolls in flight; related to kingfishers
	pigeon that executes backward somersaults in flight or on the ground
	a cylinder that revolves
	a mechanical device consisting of a cylindrical tube around which the hair is wound to curl it
	a small wheel without spokes (as on a roller skate)
	a long heavy sea wave as it advances towards the shore

Difference between mechanical device and roller

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