railway junction vs junction

railway junction and junction both are nouns.

Word	Noun	Adjective	Verb	Adverb
railway junction	Yes	No	No	No
junction	Yes	No	No	No

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

railway junction (noun)	junction (noun)
a junction where two or more railway lines meet or cross	an act of joining or adjoining things
	the place where two or more things come together
	something that joins or connects
	the shape or manner in which things come together and a connection is made
	the state of being joined together