convenience vs user-friendliness

convenience

noun

  • The quality of being convenient. 

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

  • A convenient time. 

verb

  • To make convenient 

user-friendliness

noun

  • The quality of being user-friendly. 

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