human vs in question

human

adj
  • Having the nature or attributes of a human being. 

  • Of or belonging to the species Homo sapiens or its closest relatives. 

noun
  • The tallest, most abundant and most intelligent of primates; Homo sapiens. 

  • Any hominid of the genus Homo. 

verb
  • To behave as or become, or to cause to behave as or become, a human. 

in question

adj
  • Under consideration, under discussion. 

  • In doubt, under dispute. 

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