There are 17 words that start with 'decima'.
| decimal | decimals |
| decimate | decimally |
| decimated | decimates |
| decimator | decimalize |
| decimating | decimation |
| decimators | decimalized |
| decimalizes | decimations |
| decimalizing | decimalization |
| decimalizations | |
Note: These 17 words that start with 'decima' are found from the USA & Canada version of the tournament Scrabble word list.