street corner vs intersection

street corner and intersection both are nouns.

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

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

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

street corner (noun)	intersection (noun)
the intersection of two streets	the act of intersecting (as joining by causing your path to intersect your target's path)
	a junction where one street or road crosses another
	a point where lines intersect
	a representation of common ground between theories or phenomena
	the set of elements common to two or more sets
	a point or set of points common to two or more geometric configurations