continual vs repeatable

continual

adj
  • Recurring in steady, rapid succession. 

  • Seemingly continuous; appearing to have no end or interruption. 

  • Forming a continuous series. 

repeatable

adj
  • Able to be repeated 

  • That gives the same results when repeated 

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