gloom vs regret

gloom

verb
  • To look or feel sad, sullen or despondent. 

  • To be dark or gloomy. 

  • To shine or appear obscurely or imperfectly; to glimmer. 

  • To fill with gloom; to make sad, dismal, or sullen. 

  • To render gloomy or dark; to obscure; to darken. 

noun
  • Cloudiness or heaviness of mind; melancholy; aspect of sorrow; low spirits; dullness. 

  • A depressing, despondent, or melancholic atmosphere. 

  • A drying oven used in gunpowder manufacture. 

  • Darkness, dimness, or obscurity. 

regret

verb
  • To feel sorry about (any thing). 

  • To feel sorry about (a thing that has or has not happened), afterthink: to wish that a thing had not happened, that something else had happened instead. 

noun
  • Emotional pain on account of something done or experienced in the past, with a wish that it had been different; a looking back with dissatisfaction or with longing. 

  • The amount of avoidable loss that results from choosing the wrong action. 

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