African-American vs black man

African-American

noun
  • Any black person. 

  • A black American. 

adj
  • Of or pertaining to the culture of African-American people. 

  • An American who is of Sub-Saharan African ancestry. 

  • American and black. 

  • Of Black African descent. 

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. 

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