elegiac vs mournful

elegiac

adj
  • Expressing sorrow or mourning. 

  • Of or relating to an elegy. 

noun
  • A poem composed in the couplet style of classical elegies: a line of dactylic hexameter followed by a line of dactylic pentameter. 

mournful

adj
  • Fit to inspire mourning; tragic. 

  • Filled with grief or sadness; being in a state in which one mourns. 

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