wheelwork vs mechanical device

wheelwork and mechanical device both are nouns.

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

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

wheelwork: mechanical device including an arrangement of wheel in a machine (especially a train of gears)
mechanical device: mechanism consisting of a device that works on mechanical principles

wheelwork (noun)	mechanical device (noun)
mechanical device including an arrangement of wheel in a machine (especially a train of gears)	mechanism consisting of a device that works on mechanical principles