There are 15 words that start with 'arca'.
| arcade | arcana | arcane |
| arcaded | arcades | arcadia |
| arcanum | arcadian | arcadias |
| arcading | arcanums | arcature |
| arcadians | arcadings | arcatures |
Note: These 15 words that start with 'arca' are found from the USA & Canada version of the tournament Scrabble word list.