There are 15 words that start with 'pento'.
| pentode | pentose |
| pentodes | pentomic |
| pentosan | pentoses |
| pentosans | pentoside |
| pentoxide | pentosides |
| pentoxides | pentobarbital |
| pentobarbitals | pentobarbitone |
| pentobarbitones | |
Note: These 15 words that start with 'pento' are found from the USA & Canada version of the tournament Scrabble word list.