accessibility vs convenience

accessibility

noun
  • The quality of being accessible, or of admitting approach; receptiveness. 

  • Features that increase software usability for users with certain impairments. 

convenience

noun
  • The quality of being convenient. 

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

  • A convenient time. 

verb
  • To make convenient 

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