congenial vs fit for purpose

congenial

adj
  • Suitable to one’s needs. 

  • Friendly or sociable. 

  • Having the same or very similar nature, personality, tastes, habits or interests. 

fit for purpose

adj
  • appropriate, and of a necessary standard, for its intended use. 

How often have the words congenial and fit for purpose occurred in a corpus of books? (source: Google Ngram Viewer )