The metal that ends with the letter "R" is "silver." Silver is a lustrous, white metal known for its conductivity and use in jewelry, coins, and electronics. Its chemical symbol is Ag, derived from the Latin word for silver, "argentum."
Some six letter words ending in R are:antleranswerbeaverbetterbitterborderbutlerbuttercratercursorcuterfalterfiltergarterhamperhatterhealerheaterhotterjuniorkinderladderlardermurderporterpotter
Gibraltar ends with an r.
Brass.
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This alloy is brass.
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