railroad station vs depot

railroad station and depot both are nouns.

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

As nouns, depot is a hypernym of railroad station; that is, depot is a word with a broader meaning than railroad station:

railroad station: a terminal/node where trains load or unload passengers or goods
depot: station where transport vehicles load or unload passengers or goods

Other hypernyms of railroad station include terminal, terminus.

railroad station (noun)	depot (noun)
a terminal/node where trains load or unload passengers or goods	station where transport vehicles load or unload passengers or goods
	a depository for goods