turning point vs street corner

turning point and street corner both are nouns.

Word	Noun	Adjective	Verb	Adverb
turning point	Yes	No	No	No
street corner	Yes	No	No	No

As nouns, turning point and street corner are synonyms defined as:

Other synonyms of turning point include corner.

turning point (noun)	street corner (noun)
the intersection of two streets	the intersection of two streets
an event marking a unique or important historical change of course or one on which important developments depend