noon vs noonday

noon

noun
  • The time of day when the sun is in its zenith; twelve o'clock in the day, midday. 

  • The highest point; culmination. 

  • The letter ن in the Arabic script. 

verb
  • To relax or sleep around midday 

noonday

noun
  • The time of noon; the time of day when the sun is highest in the sky, especially on a hot day. 

  • The time of greatest prosperity. 

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