groaning vs threnody

groaning

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

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

  • That groans. 

threnody

noun
  • A song or poem of lamentation or mourning for a dead person; a dirge; an elegy. 

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