expectancy vs overextension

expectancy

noun
  • The state of being expected. 

  • Expectation or anticipation; the state of expecting something. 

  • Future interest as to possession or enjoyment 

overextension

noun
  • The state or quality of being overextended; extension beyond normal, correct, or appropriate bounds or limits. 

  • Application of a term to too many referents, as for example when a child uses cat to refer to all animals. 

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