There are 15 12-letter words that start with 'pen'.
| penalization | penetrations | penetrometer | 
| penitentiary | pennycresses | pennyweights | 
| pennywhistle | pensionaries | pentagonally | 
| pentahedrons | pentamidines | pentapeptide | 
| pentathletes | pentazocines | pentlandites | 
Note: These 15 12-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)