courageous vs tenacious

courageous

adj
  • Of a person, displaying or possessing courage. 

  • Of an action, that requires courage. 

tenacious

adj
  • Unwilling to yield or give up; dogged. 

  • Having a good memory; retentive. 

  • Holding together; cohesive. 

  • Clinging to an object or surface; adhesive. 

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