epicyclic gear train vs epicyclic train

epicyclic gear train and epicyclic train both are nouns.

Word	Noun	Adjective	Verb	Adverb
epicyclic gear train	Yes	No	No	No
epicyclic train	Yes	No	No	No

As nouns, epicyclic gear train and epicyclic train are synonyms defined as:

epicyclic gear train and epicyclic train: a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis

epicyclic gear train (noun)	epicyclic train (noun)
a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis	a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis