wheelwork vs geartrain

wheelwork and geartrain both are nouns.

Word	Noun	Adjective	Verb	Adverb
wheelwork	Yes	No	No	No
geartrain	Yes	No	No	No

As nouns, geartrain is a hyponym of wheelwork; that is, geartrain is a word with a more specific, narrower meaning than wheelwork:

wheelwork: mechanical device including an arrangement of wheel in a machine (especially a train of gears)
geartrain: wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed

Other hyponyms of wheelwork include gear, gearing, power train, train.

wheelwork (noun)	geartrain (noun)
mechanical device including an arrangement of wheel in a machine (especially a train of gears)	wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed