| Word | Definitions | Synonyms |
|---|---|---|
| fifteen | (adjective) being one more than fourteen | Synonyms: 15, xv |
| fifteenth | (adjective) coming next after the fourteenth and just before the sixteenth in position | Synonyms: 15th |
| fifth | (adjective) coming next after the fourth and just before the sixth in position | Synonyms: 5th |
| fiftieth | (adjective) the ordinal number of fifty in counting order | Synonyms: 50th |
| fifty | (adjective) being ten more than forty | Synonyms: 50, l |