admixture vs fusing

admixture

noun
  • A mixture, in some contexts 

  • a mixture composed of entities retaining their individual properties. 

  • A mixing-in of a biologically or genetically differentiated group to an established stock. 

  • An instance of admixing, a mixing in of something. 

fusing

noun
  • Synonym of fusion 

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