railway station vs depot

railway station and depot both are nouns.

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

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

railway 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 railway station include terminal, terminus.

railway 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