gradin vs rung

gradin

noun
  • Any of a series of terraced steps or seats, as in an arena or an altar. 

rung

noun
  • A crosspiece between legs of a chair. 

  • A crosspiece forming a step of a ladder; a round. 

  • A position in a hierarchy. 

verb
  • simple past tense of ring 

adj
  • Of a pig: having a ring through the nose. 

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