There are 5 14-letter words that start with 'pen'.
| penicillamines | penicillinases | 
| penitentiaries | pentobarbitals | 
| pentobarbitone | |
Note: These 5 14-letter words that start with 'pen' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with pent, penn, pens, peni, penu, pena, pene, pend, penc, peno, peng, penl, penm, penh, penk, penp.
4-letter words start with 'pen' (3)