quirk vs usual

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. 

usual

noun
  • A specific good or service (e.g. a drink) that someone typically orders. 

  • The typical state of something, or something that is typical. 

adj
  • Most commonly occurring; typical. 

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