federation vs fusing

federation

noun
  • Act of joining together into a single political entity. 

  • Any society or organisation formed from separate groups or bodies. 

  • A collection of network or telecommunication providers that offer interoperability. 

  • Array of nations or states that are unified under one central authority which is elected by its members. 

adj
  • Of an architectural style popular around the time of federation. 

fusing

noun
  • Synonym of fusion 

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