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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):
metal

WordNet sense 2 (the state of impairing the quality or reducing the value of something):
admixture

WordNet sense 3 (lower in value by increasing the base-metal content):
debase


From the ODE community, based on WordNetadd/edit