elegy vs groaning

elegy

noun
  • A mournful or plaintive poem; a funeral song; a poem of lamentation. 

  • A composition of mournful character. 

  • A classical poem written in elegiac meter 

groaning

noun
  • A low sound associated with extended suffering, sorrow, and toil. 

adj
  • Heavily laden, as if to creak under the strain. 

  • That groans. 

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