Epicyclic train and Geartrain

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

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

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

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