junction vs crossing

junction and crossing both are nouns.

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

As nouns, crossing is a hyponym of junction; that is, crossing is a word with a more specific, narrower meaning than junction:

junction (noun)	crossing (noun)
an act of joining or adjoining things	a voyage across a body of water (usually across the Atlantic Ocean)
the place where two or more things come together	traveling across
something that joins or connects	(genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids
the shape or manner in which things come together and a connection is made	a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other
the state of being joined together	a junction where one street or road crosses another
	a point where two lines (paths or arcs etc.) intersect
	a shallow area in a stream that can be forded