way station vs railway station

way station and railway station both are nouns.

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

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

way station: a small railway station between the principal stations or a station where the train stops only on a signal
railway station: a terminal/node where trains load or unload passengers or goods

Other hypernyms of way station include railroad station, railroad terminal, train depot, train station.

way station (noun)	railway station (noun)
a small railway station between the principal stations or a station where the train stops only on a signal	a terminal/node where trains load or unload passengers or goods
a stopping place on a journey