maintain vs travel

maintain

verb
  • To keep up; to preserve; to uphold (a state, condition etc.). 

  • To declare or affirm (a clause) to be true; to assert. 

travel

verb
  • To force to journey. 

  • To move illegally by walking or running without dribbling the ball. 

  • To travel throughout (a place). 

  • To pass from one place to another; to move or transmit 

  • To be on a journey, often for pleasure or business and with luggage; to go from one place to another. 

noun
  • An account of one's travels. 

  • The working motion of a piece of machinery; the length of a mechanical stroke. 

  • The activity or traffic along a route or through a given point. 

  • Distance that a keyboard's key moves vertically when depressed. 

  • The act of traveling; passage from place to place. 

  • A series of journeys. 

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