The answer to your question, "a word that starts with n and ends with n," is a bit tricky! There isn't a commonly used word in the English language that fits that exact description. Most words that start with "n" and end with "n" are proper nouns (names of people or places) or are highly specialized technical terms.
To give you some possibilities, depending on your intent:
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If you're looking for a single word: You might be thinking of a word that sounds like it fits this pattern, but there's no perfect match in standard English dictionaries. We can search for obscure words or coin a new word. However, such words wouldn't be widely understood.
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If you're open to using two words: The phrase "never again" fits the criteria, starting with an 'n' and ending with an 'n'.
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If you are looking for other possibilities: Consider thinking about longer words or words that use less common letter combinations or proper nouns as alternatives to find something suitable.
Ultimately, the best answer depends on the context. Let me know if you have a specific application in mind, and I might be able to offer more tailored suggestions.