constancy vs quirk

constancy

noun
  • The quality of being constant; steadiness or faithfulness in action, affections, purpose, etc. 

  • An unchanging quality or characteristic of a person or thing. 

quirk

noun
  • An acute angle dividing a molding; a groove that runs lengthwise between the upper part of a moulding and a soffit. 

  • An idiosyncrasy; a slight glitch, mannerism; something unusual about the manner or style of something or someone. 

verb
  • To (cause to) move with a wry jerk. 

  • To furnish with a quirk or channel. 

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