There are 14 words that start with 'falsi'.
| falsie | falsies | 
| falsify | falsity | 
| falsified | falsifier | 
| falsifies | falsities | 
| falsifiers | falsifying | 
| falsifiable | falsification | 
| falsifiability | falsifications | 
Note: These 14 words that start with 'falsi' are found from the USA & Canada version of the tournament Scrabble word list.