preference vs restriction

preference

noun
  • The state of being preferred over others. 

  • 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") 

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

  • A strong liking or personal valuation. 

  • A preferential bias; partiality; discrimination. 

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

restriction

noun
  • The act of restricting, or the state of being restricted. 

  • A regulation or limitation that restricts. 

  • The mechanism by which a cell degrades foreign DNA material. 

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