amalgamate vs pleach

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. 

pleach

verb
  • To unite by interweaving, as (horticulture) branches of shrubs, trees, etc., to create a hedge; to interlock, to plash. 

noun
  • An act or result of interweaving; specifically, (horticulture) a hedge or lattice created by interweaving the branches of shrubs, trees, etc. 

  • A notch cut into a branch so that it can be bent when pleaching is carried out. 

  • A branch of a shrub, tree, etc., used for pleaching; a pleacher. 

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