Epicyclic gear train and Geartrain

Epicyclic gear train noun - A system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis.

Geartrain and epicyclic gear train are semantically related. In some cases you can use "Geartrain" instead a noun phrase "Epicyclic gear train".

Geartrain noun - Wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed.

Epicyclic gear train and geartrain are semantically related. Sometimes you can replace phrase "Epicyclic gear train" with "Geartrain", this terms are similar.