There are 14 words that start with 'proca'.
| procarp | procaine |
| procarps | procaines |
| procambia | procambial |
| procambium | procaryote |
| procambiums | procaryotes |
| procarbazine | procathedral |
| procarbazines | procathedrals |
Note: These 14 words that start with 'proca' are found from the USA & Canada version of the tournament Scrabble word list.