There are 18 words that start with 'fif'.
| fife | fifed | fifer |
| fifes | fifth | fifty |
| fifers | fifing | fifths |
| fifteen | fifthly | fifties |
| fifteens | fiftieth | fiftyish |
| fifteenth | fiftieths | fifteenths |
Note: These 18 words that start with 'fif' are found from the USA & Canada version of the tournament Scrabble word list.