corncob vs rachis

corncob

noun
  • The central cylindrical core of an ear of corn (maize) on which the kernels are attached in rows. 

verb
  • To disintegrate by the blades becoming severed from the axis 

  • To defeat (someone) who then refuses to admit defeat. 

rachis

noun
  • The main shaft of either a compound leaf, head of grain, or fern frond. 

  • An anatomical shaft or axis in a marine invertebrate. 

  • The central shaft of a feather. 

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