There are 11 words that start with 'periph'.
| periphery | peripheral | periphytic |
| periphyton | peripherals | peripheries |
| periphrases | periphrasis | periphytons |
| peripherally | periphrastic | |
Note: These 11 words that start with 'periph' are found from the USA & Canada version of the tournament Scrabble word list.