roller vs mechanical device

mechanical device vs roller

roller and mechanical device both are nouns.

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

As nouns, mechanical device is a hypernym of roller; that is, mechanical device is a word with a broader meaning than roller:

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

roller (noun)	mechanical device (noun)
a grounder that rolls along the infield	mechanism consisting of a device that works on mechanical principles
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 roller and mechanical device

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