The noun copper is an element. The adjective form means made of copper, or copper-colored.
The noun "copper" meaning a copper coin (or slang for a policeman) would have the plural coppers.
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The plural of 'this' is 'these' and the plural of 'that' is 'those'.
The plural form of can is cans.
The plural for the noun loss is losses; the plural possessive is losses'.
The plural is a normal S plural, associates.
The plural of "race" is "races."