Singular to Plural With a ‘C’

There is a certain word in the English language that is singular. However, when the letter ‘C’ is added somewhere into the word, the word becomes pluralised. What is this word?

Scroll down for a clue and further down for the answer.

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Clue: The singular word only contains 3 letters.

Scroll down for the answer.

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Answer: DIE becomes DICE.