There are 10 words that start with 'porph'.
| porphyry | porphyria |
| porphyric | porphyrin |
| porphyrias | porphyries |
| porphyrins | porphyritic |
| porphyropsin | porphyropsins |
Note: These 10 words that start with 'porph' are found from the USA & Canada version of the tournament Scrabble word list.