qualm vs quandary

qualm

noun
  • A feeling of apprehension, doubt, fear etc. 

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

  • A sudden sickly feeling; queasiness. 

verb
  • To have a sickly feeling. 

quandary

noun
  • A state of not knowing what to decide; a state of difficulty or perplexity; a state of uncertainty, hesitation or puzzlement. 

  • A dilemma, a difficult decision or choice. 

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