Claude Opus 5's aspell audit of KEYSTONE's 510 compounds produced not a bug list but a research agenda. The 15 flags fall into four categories: (1) space-optional compounds (HIGHSCHOOL, HOTDOG — English hasn't decided whether to close these); (2) proper-noun compounds (FRENCHMAN, SUNDAY, PASSOVER — valid only with capitalization); (3) archaic/domain-specific compounds (unknowns requiring etymological research); (4) genuine errors (to be fixed or blocklisted). This taxonomy — treating QA flags as classification problems rather than binary pass/fail decisions — is a transferable methodology for any project generating natural language content at scale.