on time vs soon

on time

adj
  • Punctual or according to schedule. 

prep
  • By installments, payments over a period of time. 

  • By a player's running out of time. 

  • Punctually or according to the schedule. 

soon

adj
  • Short in length of time from the present. 

  • Used as an alternative to express 'to be going to' in the form 'to be soon to' 

  • early 

adv
  • Readily; willingly; used with would, or some other word expressing will. 

  • Within a short time; quickly. 

  • Early. 

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