Nouns

(n)alloy, metala mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten“brass is an alloy of zinc and copper”
(n)admixture, alloythe state of impairing the quality or reducing the value of something

Verbs

(v)debase, alloylower in value by increasing the base-metal content
(v)alloymake an alloy of