There are alternative forms of code, like using obscure languages: World War II's Navajo “windtalkers” are a well-known case.
Source: wiktionary
Windtalker
Synonyms for "windtalker" (2 found)
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Noun(1 words)
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Even when they forced a captured Navajo soldier, who was not a Windtalker, to translate intercepted messages, he could not make head or tail of the stream of words because of the code within a code.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.