disbelief vs estimation

disbelief

noun
  • Unpreparedness, unwillingness, or inability to believe that something is the case. 

  • Astonishment. 

  • The loss or abandonment of a belief; cessation of belief. 

estimation

noun
  • Esteem or favourable regard. 

  • The process of making an estimate. 

  • The amount, extent, position, size, or value reached in an estimate. 

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