federation vs severance

federation

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

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

  • Act of joining together into a single political entity. 

  • 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. 

severance

noun
  • A separation. 

  • The act of severing or the state of being severed. 

  • A severance payment. 

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