causal vs ready

causal

noun
  • a word (such as because) that expresses a reason or a cause 

adj
  • of, relating to, or being a cause of something; causing 

ready

verb
  • To prepare; to make ready for action. 

adj
  • Not slow or hesitating; quick in action or perception of any kind. 

  • Prepared for immediate action or use. 

  • Offering itself at once; at hand; opportune; convenient. 

  • Inclined; apt to happen. 

  • Liable at any moment. 

noun
  • ready money; cash 

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