foreboding vs qualm

foreboding

noun
  • A sense of evil to come. 

  • An evil omen. 

adj
  • Of ominous significance; serving as an ill omen; foretelling of harm or difficulty. 

qualm

noun
  • A prick of the conscience; a moral scruple, a pang of guilt. 

  • A feeling of apprehension, doubt, fear etc. 

  • A sudden sickly feeling; queasiness. 

verb
  • To have a sickly feeling. 

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