federation vs smelting

federation

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

smelting

noun
  • The process of melting or fusion, especially to extract a metal from its ore. 

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