/**
 * Generates a random pronounceable word.
 *
 * @param length - Length of the word (default: 6). Must be between 1 and 20.
 * @returns A random pronounceable word with alternating consonants and vowels.
 *
 * @throws {Error} If length is NaN.
 * @throws {Error} If length is not an integer.
 * @throws {Error} If length is less than 1 or greater than 20.
 *
 * @example
 * // Generate default 6-letter word
 * randomWord(); // 'tapole'
 *
 * @example
 * // Generate 4-letter word
 * randomWord(4); // 'buzo'
 *
 * @example
 * // Generate 10-letter word
 * randomWord(10); // 'fokirabemu'
 *
 * @note Uses Math.random() for non-cryptographic randomness.
 * @note Words are generated with alternating consonants and vowels for pronounceability.
 *
 * @complexity Time: O(n), Space: O(n) where n is length
 */
export declare function randomWord(length?: number): string;
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