black man vs blacky

black man

noun
  • Used other than figuratively or idiomatically: see black, man. 

  • A male adult member of an ethnic group having dark pigmentation of the skin, typically of sub-Saharan African descent; or the appearance thereof. 

blacky

noun
  • A black person. 

How often have the words black man and blacky occurred in a corpus of books? (source: Google Ngram Viewer )