grieving vs groaning

grieving

noun
  • An act or instance of feeling or expressing grief. 

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 grieving and groaning occurred in a corpus of books? (source: Google Ngram Viewer )