There are 15 words that start with 'phenyl'.
| phenyl | phenyls |
| phenylic | phenylene |
| phenylenes | phenylalanine |
| phenylephrine | phenylalanines |
| phenylbutazone | phenylephrines |
| phenylthiourea | phenylbutazones |
| phenylketonuria | phenylketonuric |
| phenylthioureas | |
Note: These 15 words that start with 'phenyl' are found from the USA & Canada version of the tournament Scrabble word list.