disallow vs rule out

disallow

verb
  • To refuse to allow 

  • To reject as invalid, untrue, or improper 

  • to overrule a colonial legislation by the sovereign-in-privy council 

rule out

verb
  • To disallow. 

  • To reject an option from a list of possibilities. 

  • To make something impossible. 

  • To cross an item out by drawing a straight line through it, as with a ruler. 

  • To make unavailable. 

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