functioning vs working

functioning

noun
  • Action of the verb function. 

  • Manner by which something functions; the workings. 

adj
  • Mentally disabled but still able to survive in wider society. 

  • Functional, working 

working

noun
  • Operation; action. 

  • Method of operation. 

  • Becoming full of a vegetable substance. 

  • The incidental or subsidiary calculations performed in solving an overall problem. 

  • A train movement. 

  • Fermentation. 

  • A place where work is carried on. 

adj
  • In paid employment. 

  • Enough to allow one to use something. 

  • Used in real life; practical. 

  • Of or relating to employment. 

  • That suffices but requires additional work. 

  • That is or are functioning. 

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