There are 2 14-letter words that start with 'pac'.
| pachydermatous | pacifistically | 
Note: These 2 14-letter words that start with 'pac' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with pack, paci, pach, pace, pact, paca, pacl, pacs, pacy.
4-letter words start with 'pac' (6)