There are 12 11-letter words that start with 'pac'.
| pacemakings | pacesetters | pacesetting | 
| pachysandra | pacifically | pacificator | 
| pacificisms | pacificists | packability | 
| packsaddles | packthreads | paclitaxels | 
Note: These 12 11-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)