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The phonetic word that replaces the letter 'D' is "Delta." This term is part of the NATO phonetic alphabet, which is used to ensure clear communication, especially in verbal exchanges over radio or telephone where miscommunication can occur. Each letter of the alphabet is associated with a specific word to avoid confusion, particularly with similar-sounding letters. Using "Delta" for 'D' helps convey the intended message accurately, as it stands out from other letters phonetically. This system is widely used in military and aviation contexts to maintain clarity. The other options do not serve this purpose within the phonetic alphabet framework; they do not specifically represent the letter 'D.'