observation wheel vs panjandrum

observation wheel

noun
  • Ferris wheel 

panjandrum

noun
  • A massive, rocket-propelled, explosive-laden cart designed by the British military during World War II. 

  • An important, powerful or influential person. 

  • A self-important or pretentious person. 

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