rim vs rounding

rim

noun
  • An edge around something, especially when circular. 

  • A wheelrim. 

  • A membrane. 

  • A semicircular copydesk. 

verb
  • To form a rim on. 

  • To roll around a rim. 

  • To lick the anus of a partner as a sexual act. 

  • To follow the contours, possibly creating a circuit. 

rounding

noun
  • A rounded surface; a curve. 

  • The numerical value obtained by this process. 

  • The act by which a numerical value is rounded. 

  • In bookbinding, the shaping of the folded and sewed sheets into a convex form at the back. 

  • The act of making anything round, as the lips in pronouncing some vowels. 

adj
  • Round or nearly round; becoming round; roundish. 

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