mumbo jumbo vs plain English

mumbo jumbo

noun
  • Any object of superstition; religious words and/or actions which are seen as superstitious or fraudulent. 

  • A deity or other supernatural being said to have been worshipped by certain West African peoples; an idol. 

  • Any confusing or meaningless speech; nonsense, gibberish. 

plain English

noun
  • English that does not use any jargon or technical / scientific terminology. 

How often have the words mumbo jumbo and plain English occurred in a corpus of books? (source: Google Ngram Viewer )