preference vs weakness

preference

noun
  • A strong liking or personal valuation. 

  • The option to so select, and the one selected. 

  • The selection of one thing or person over others (with the main adposition being "for" in relation to the thing or person, but possibly also "of") 

  • The state of being preferred over others. 

  • Preferans, a card game, principally played in Eastern Europe. 

  • A preferential bias; partiality; discrimination. 

verb
  • To give preferential treatment to; to give a preference to. 

weakness

noun
  • A special fondness or desire. 

  • An inadequate quality; fault 

  • The condition of being weak. 

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