scare vs warning bell

scare

noun
  • A cause of slight terror; something that inspires fear or dread. 

  • A minor fright. 

  • A device or object used to frighten. 

adj
  • lean; scanty 

verb
  • To frighten, terrify, startle, especially in a minor way. 

warning bell

noun
  • A problematic or alarming aspect. 

  • A bell rung to warn people of a danger. 

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