convenience vs effort

convenience

verb
  • To make convenient 

noun
  • Any object that makes life more convenient; a helpful item. 

  • The quality of being convenient. 

  • A convenient time. 

effort

verb
  • To make an effort. 

noun
  • An endeavor. 

  • The work involved in performing an activity; exertion. 

  • A force acting on a body in the direction of its motion. 

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