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Why quiz becomes quizzes, and how to practice the rule

The short answer is a doubled z. Below you will find the rule, worked examples, and a way to practice it on your own notes.

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The rule behind quizzes

Spelling questions like why the plural of quiz is quizzes usually come down to one pattern: a short stressed vowel followed by a single consonant doubles that consonant before -es. Quiz has a short i and a single final z, so the z doubles and becomes quizzes.

Quiz follows the doubling rule: short vowel, single consonant, then -zes.
Quizes is a common misspelling and is not the standard plural.
Words like box and waltz show that the rule has clear limits.
Testing the pattern on new words is the fastest way to make it stick.

Example spelling pairs that follow the quiz rule

Why is the plural of quiz spelled quizzes?The z doubles because quiz has a short vowel followed by one consonant, and the doubling keeps that vowel short before the -es ending.

What is the plural of fez?fezzes. It matches quiz: a short vowel, a single final z, and then the z doubles before -es.

What is the plural of whiz?whizzes. The short i and single z trigger the same doubling as quiz.

What is the plural of box?boxes. English does not double x, so only -es is added.

What is the plural of waltz?waltzes. The z follows another consonant rather than a short vowel, so nothing doubles.

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The same pattern explains fez to fezzes and whiz to whizzes. Words ending in x, such as box, take only -es because English does not double x, and words like waltz do not double either because the z follows another consonant. The origin of quiz is uncertain, and a popular story about a Dublin bet in the 1780s is generally treated as unreliable, so the pattern is a more dependable explanation than history.

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Frequently asked questions

Why does quiz double the z but box does not?

The doubling happens after a single short vowel and a single consonant, which is the case in quiz. Box ends in x, and English does not double x, so only -es is added.

Is quizes ever correct?

No, quizes is a common misspelling. Quizzes is the standard plural in dictionaries and style guides.

How should I study spelling rules like this one?

Group words by pattern, say each rule aloud, and test yourself on new words that follow it. Mixing in a few exceptions helps you remember where the rule stops.

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