caution vs discretion

caution

noun
  • Prudence when faced with, or when expecting to face, danger; care taken in order to avoid risk or harm. 

  • A formal warning given as an alternative to prosecution in minor cases. 

  • Security; guaranty; bail. 

  • A yellow card. 

  • A careful attention to the probable effects of an act, in order that failure or harm may be avoided. 

verb
  • To warn; to alert, advise that caution is warranted. 

  • To give a yellow card 

discretion

noun
  • The quality of being discreet. 

  • The freedom to make one's own judgements. 

  • Individual justice from experience in quality of perception: discrete. 

  • The ability to make wise choices or decisions. 

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