This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2023. The accepted answer to this question will be awarded a bounty worth 50 reputation.
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Resolve the novel connecting wall below into six groups of four connected words and discover the puzzle's hidden theme... What links the six group connections?
| ALMOST | AMERICAN | BLATTER | BUSH | CHESTNUT | COST |
| DELIGHT | EVIL | LOST | MODERN | ORDINARY | PAL |
| PERSONAL | PIE | PLASTIC | PUNJAB | PURSE | ROOT |
| ROSE | SACRAMENTO | SOUTHERN | SUM | SYDNEY | WHEDON |