Synonyms for Alloy (same or very similar meaning)
WordNet sense 1 (a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten):
metalWordNet sense 2 (the state of impairing the quality or reducing the value of something):
admixtureWordNet sense 3 (lower in value by increasing the base-metal content):
debaseFrom the ODE community, based on WordNetadd/edit