street corner vs crossing

street corner and crossing both are nouns.

Word	Noun	Adjective	Verb	Adverb
street corner	Yes	No	No	No
crossing	Yes	No	No	No

As nouns, crossing is a hypernym of street corner; that is, crossing is a word with a broader meaning than street corner:

Other hypernyms of street corner include carrefour, crossroad, crossway, intersection.

street corner (noun)	crossing (noun)
the intersection of two streets	a voyage across a body of water (usually across the Atlantic Ocean)
	traveling across
	(genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids
	a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other
	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