railroad terminal vs depot

railroad terminal and depot both are nouns.

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

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

railroad terminal: 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 terminal include terminal, terminus.

railroad terminal (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