There are 10 words that start with 'tachy'.
| tachyon | tachyons |
| tachylite | tachylyte |
| tachyonic | tachylites |
| tachylytes | tachycardia |
| tachycardias | tachyarrhythmia |
Note: These 10 words that start with 'tachy' are found from the USA & Canada version of the tournament Scrabble word list.