train depot vs railroad station

train depot and railroad station both are nouns.

Word	Noun	Adjective	Verb	Adverb
train depot	Yes	No	No	No
railroad station	Yes	No	No	No

As nouns, train depot and railroad station are synonyms defined as:

train depot and railroad station: a terminal/node where trains load or unload passengers or goods

Other synonyms of train depot include railroad terminal, railway station, train station.

train depot (noun)	railroad station (noun)
a terminal/node where trains load or unload passengers or goods	a terminal/node where trains load or unload passengers or goods