There are 11 words that start with 'fibril'.
| fibril | fibrils |
| fibrilla | fibrillae |
| fibrillar | fibrillate |
| fibrillated | fibrillates |
| fibrillating | fibrillation |
| fibrillations | |
Note: These 11 words that start with 'fibril' are found from the USA & Canada version of the tournament Scrabble word list.