There are 12 13-letter words that start with 'pha'.
| phagocytizing | phagocytosing | 
| phalansteries | phallocentric | 
| phanerophytes | pharisaically | 
| pharmacognosy | pharmacologic | 
| pharmacopeial | pharmacopeias | 
| pharmacopoeia | pharyngitides | 
Note: These 12 13-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)