on time vs oversoon

on time

prep

  • By installments, payments over a period of time. 

  • By a player's running out of time. 

  • Punctually or according to the schedule. 

adj

  • Punctual or according to schedule. 

oversoon

adv

  • Too soon; prematurely. 

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