faltering vs qualm

faltering

noun

  • hesitancy 

adj

  • hesitant, halting 

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. 

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