gloom vs melancholia

gloom

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. 

verb
  • 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 look or feel sad, sullen or despondent. 

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

melancholia

noun
  • Deep sadness or gloom; melancholy 

  • depression, characterised by irrational fears, guilt and apathy 

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