There are 14 words that start with 'isa'.
| isatin | isagoge | isatine |
| isatins | isagoges | isagogic |
| isarithm | isatines | isatinic |
| isagogics | isallobar | isarithms |
| isallobars | isallobaric | |
Note: These 14 words that start with 'isa' are found from the USA & Canada version of the tournament Scrabble word list.