noon vs twelve o’clock

noon

verb

  • To relax or sleep around midday 

noun

  • The highest point; culmination. 

  • The letter ن in the Arabic script. 

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

twelve o’clock

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