lament vs waul

lament

verb
  • To express grief; to weep or wail; to mourn. 

  • To feel great sorrow or regret; to bewail. 

noun
  • A song expressing grief. 

  • An expression of grief, suffering, sadness or regret. 

waul

verb
  • To wail, to cry plaintively. 

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