affability vs convenience

affability

noun
  • The state or quality of being affable, friendly, or approachable. 

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 affability and convenience occurred in a corpus of books? (source: Google Ngram Viewer )