confusion vs uncertainty

confusion

noun
  • A lack of clarity or order. 

  • The act of mistaking one thing for another or conflating distinct things. 

  • The state of being confused; misunderstanding. 

  • Lack of understanding due to dementia. 

uncertainty

noun
  • Something uncertain or ambiguous. 

  • Doubt; the condition of being uncertain or without conviction. 

  • A parameter that measures the dispersion of a range of measured values. 

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