amalgamate vs subsume

amalgamate

verb
  • To merge, to combine, to blend, to join. 

  • To combine (free groups) by identifying respective isomorphic subgroups. 

  • To make an alloy of a metal and mercury. 

adj
  • Coalesced; united; combined. 

subsume

verb
  • To place (any one cognition) under another as belonging to it; to include or contain something else. 

  • To consider an occurrence as part of a principle or rule; to colligate 

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