afternoon vs noon

afternoon

noun
  • The part of the day from noon or lunchtime until sunset, evening, or suppertime or 6pm. 

  • The later part of anything, often with implications of decline. 

  • A party or social event held in the afternoon. 

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 

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