gearing vs power train

gearing and power train both are nouns.

Word	Noun	Adjective	Verb	Adverb
gearing	Yes	No	No	No
power train	Yes	No	No	No

As nouns, gearing and power train are synonyms defined as:

gearing and power train: wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed

Other synonyms of gearing include gear, geartrain, train.

gearing (noun)	power train (noun)
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed	wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed