offshoot vs withy

offshoot

noun
  • That which shoots off or separates from a main stem or branch of a plant. 

  • That which develops from something else. 

withy

noun
  • A long flexible twig of the osier; a withe. 

  • The osier (Salix viminalis), a type of willow. 

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