likely vs soon-to-be

likely

adj
  • appropriate, suitable; believable; promising, having a good potential 

  • probable; having a greater-than-even chance of occurring 

  • Reasonably to be expected; apparently destined, probable 

  • attractive; pleasant 

  • plausible; within the realm of credibility 

  • leading with high probability to some specified outcome 

noun
  • Something or somebody considered likely. 

adv
  • Probably. 

soon-to-be

adj
  • Planned or destined to have a specified position or quality in the near future. 

How often have the words likely and soon-to-be occurred in a corpus of books? (source: Google Ngram Viewer )