eureka vs rigamajig

eureka

noun
  • Synonym of constantan (“copper-nickel alloy”) 

intj
  • An exclamation indicating sudden discovery. 

rigamajig

noun
  • A thingy; a miscellaneous or nameless object. 

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