fanlight vs rung

fanlight

noun
  • a semicircular or semioval window over a door or other window, normally having a fan-like structure of ribs; sometimes hinged to the transom 

  • an electric fan, usually a ceiling fan, that is also a light fixture 

rung

noun
  • A crosspiece between legs of a chair. 

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

  • A position in a hierarchy. 

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

verb
  • simple past tense of ring 

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