Synonyms for Intermixture (same or very similar meaning)
WordNet sense 1 (any foodstuff made by combining different ingredients):
concoction, mixtureWordNet sense 2 (an additional ingredient that is added by mixing with the base):
admixtureWordNet sense 3 (the act of mixing together):
mix, commixture, mixingFrom the ODE community, based on WordNetadd/edit