There are 10 15-letter words that start with 'pha'.
| phantasmagorias | pharisaicalness | 
| pharmaceuticals | pharmacodynamic | 
| pharmacognosies | pharmacognostic | 
| pharmacokinetic | pharmacological | 
| pharmacologists | pharmacotherapy | 
Note: These 10 15-letter words that start with 'pha' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with phar, phal, phan, phag, phas, phat, phae.
4-letter words start with 'pha' (1)