accessibility vs easefulness

accessibility

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

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

easefulness

noun
  • State of being easeful, or a quality of promoting ease and tranquillity. 

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