apologize vs mourn

apologize

verb
  • To make an apology or excuse; to acknowledge some fault or offense, with expression of regret for it, by way of amends 

  • To express regret that a certain event has occurred. 

mourn

verb
  • To utter in a sorrowful manner. 

  • To express sadness or sorrow for; to grieve over (especially a death). 

  • To wear mourning. 

noun
  • Sorrow, grief. 

  • A ring fitted upon the head of a lance to prevent wounding an adversary in tilting. 

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