railhead vs storehouse

railhead and storehouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
railhead	Yes	No	No	No
storehouse	Yes	No	No	No

As nouns, storehouse is a hypernym of railhead; that is, storehouse is a word with a broader meaning than railhead:

railhead: a railroad depot in a theater of operations where military supplies are unloaded for distribution
storehouse: a depository for goods

Other hypernyms of railhead include depot, entrepot, storage, store.

railhead (noun)	storehouse (noun)
a railroad depot in a theater of operations where military supplies are unloaded for distribution	a depository for goods
the end of the completed track on an unfinished railway