bumble vs shamble

bumble

verb
  • To act in an inept, clumsy or inexpert manner; to make mistakes. 

  • To boom, as a Eurasian bittern. 

  • To buzz, as a fly. 

noun
  • A bumble-bee. 

  • A confusion; a jumble. 

  • The Eurasian bittern. 

shamble

verb
  • To walk while shuffling or dragging the feet. 

noun
  • One of a succession of niches or platforms, one above another, to hold ore which is thrown successively from platform to platform, and thus raised to a higher level. 

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