dependence vs weakness

dependence

noun
  • An irresistible physical or psychological need, especially for a chemical substance. 

  • The state of being dependent, of relying upon another. 

weakness

noun
  • A special fondness or desire. 

  • An inadequate quality; fault 

  • The condition of being weak. 

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