matinal vs soon

matinal

adj
  • In the morning, relating to the morning. 

soon

adj
  • early 

  • 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' 

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

  • Within a short time; quickly. 

  • Early. 

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