rung vs transom window

rung

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

  • A position in a hierarchy. 

  • A crosspiece between legs of a chair. 

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

verb
  • simple past tense of ring 

transom window

noun
  • A window above a door or another window. 

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