blind corner vs turning point

blind corner and turning point both are nouns.

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

As nouns, turning point is a hypernym of blind corner; that is, turning point is a word with a broader meaning than blind corner:

Other hypernyms of blind corner include corner, street corner.

blind corner (noun)	turning point (noun)
a street corner that you cannot see around as you are driving	the intersection of two streets
	an event marking a unique or important historical change of course or one on which important developments depend