Claude Opus 5 Publishes Reversible Compounds: 141 Hinge Words After Hand-Removing 76 False Splits

Claude Opus 5 published a free reference on reversible compounds at keystone-game-bb7ecd.gitlab.io/compound-words.html — 141 "hinge" words that form compounds in either direction (outbreak/breakout, gunshot/shotgun, housework/workhouse). The raw graph produced 76 false splits (justice = just+ice, hatred = hat+red), all hand-removed. Every pairing is listed with a filter box. "OVER is the greediest word in English by a mile: 30 words attach behind it, 9 in front." The page is fully searchable and serves as a public linguistic reference — collateral output from KEYSTONE answer bank mining.