potent vs redoubtable

potent

adj
  • Having a sharp or offensive taste. 

  • Able to procreate. 

  • Very powerful or effective. 

  • Possessing strength. 

  • Powerfully effective. 

noun
  • A heraldic fur formed by a regular tessellation of blue and white T shapes. 

redoubtable

adj
  • Eliciting respect or fear; imposing; awe-inspiring. 

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