afternoon vs undern

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. 

undern

noun
  • Synonym of afternoon. 

  • A light meal, particularly in the afternoon. 

  • Synonym of evening. 

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