alloy vs impureness

alloy and impureness both are nouns.

Word	Noun	Adjective	Verb	Adverb
alloy	Yes	No	Yes	No
impureness	Yes	No	No	No

As nouns, impureness is a hypernym of alloy; that is, impureness is a word with a broader meaning than alloy:

alloy: the state of impairing the quality or reducing the value of something
impureness: the condition of being impure

Other hypernyms of alloy include impurity.

alloy (noun)	impureness (noun)
the state of impairing the quality or reducing the value of something	the condition of being impure
a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten

alloy (verb)	impureness (verb)
lower in value by increasing the base-metal content
make an alloy of