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Coinage could be accurately described as neology.
The recent coinage of the word redonkulous is suspect.
The Coinage Act of established the United States coinage system. It was also commonly known as the Mint Act.
The following words rhyme with coinage -
forage
storage
linage
package
The answer will depend on which country's coinage the question is about.
Alluminum is probably the lightest of coinage metals used to-date.