black man vs pubescence

black man

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

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

pubescence

noun
  • A covering of fine, soft hairs. 

  • The state of being in or reaching puberty. 

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