railroad station vs train station

railroad station and train station both are nouns.

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

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

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

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

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