expel vs extrude

expel

verb
  • To deport. 

  • To eject or erupt. 

  • To remove from membership. 

extrude

verb
  • To expel; to drive off. 

  • To push or thrust out. 

  • To form or shape (a metal, plastic etc.) by forcing it through a die or an opening. 

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