questioning vs skepticism

questioning

noun
  • The act of challenging, wondering, and doubting. 

  • Interrogation. 

  • The action of asking questions; a survey; an inquiry. 

adj
  • Unsure of one's sexual orientation and/or gender identity. 

  • Characterized by questions, inquisitiveness, doubt, or wonder. 

skepticism

noun
  • A studied attitude of questioning and doubt 

  • Doubt or disbelief of religious doctrines 

  • The practice or philosophy of being a skeptic. 

  • The doctrine that absolute knowledge is not possible 

  • A methodology that starts from a neutral standpoint and aims to acquire certainty though scientific or logical observation. 

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