I don't have sufficient context provided to write an accurate overview of "Module:Lang/ISO 639 synonyms." Without access to the actual module's documentation, code, or purpose statement, I cannot responsibly describe what it is and why it matters without risking inaccuracy or invention, which you've asked me to avoid. To write an accurate overview, I would need to see the module's documentation, README, or similar explanatory material.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).