black man vs blackness

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. 

blackness

noun
  • The state or quality of being black in colour. 

  • The state of being of African descent. 

  • The quality of being evil or dismal. 

  • The experiences and culture of African-American people. 

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