| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Interruption | 12 | 7 | 5 | 4 |
| Interval | 8 | 5 | 3 | 3 |
| Introduction | 12 | 7 | 5 | 4 |
| Introversion | 12 | 7 | 5 | 4 |
| Intrusion | 9 | 5 | 4 | 3 |
| Intussusception | 15 | 9 | 6 | 5 |
| Inundate | 8 | 4 | 4 | 3 |
| Inversion | 9 | 5 | 4 | 3 |
| Involution | 10 | 5 | 5 | 4 |
| Irreligion | 10 | 5 | 5 | 4 |
| Irreligious | 11 | 5 | 6 | 4 |
| Irreligiousness | 15 | 8 | 7 | 5 |
| Irreverence | 11 | 6 | 5 | 4 |
| Irreverent | 10 | 6 | 4 | 4 |
| Jailbreak | 9 | 5 | 4 | 2 |
| Jerk Back | 9 | 7 | 2 | 2 |
| Jump | 4 | 3 | 1 | 1 |
| Juvenile Delinquency | 20 | 12 | 8 | 8 |
| Laches | 6 | 4 | 2 | 2 |
| Lacuna | 6 | 3 | 3 | 3 |
| Lag | 3 | 2 | 1 | 1 |
| Laissez Faire | 13 | 7 | 6 | 3 |
| Lapse | 5 | 3 | 2 | 2 |
| Lapsed | 6 | 4 | 2 | 1 |
| Lapse Back | 10 | 7 | 3 | 3 |
| Lapse From Grace | 16 | 11 | 5 | 4 |
| Lapsing | 7 | 5 | 2 | 2 |
| Lapsus Calami | 13 | 8 | 5 | 5 |
| Lapsus Linguae | 14 | 8 | 6 | 5 |
| Lasciviousness | 14 | 8 | 6 | 5 |
| Last | 4 | 3 | 1 | 1 |
| Last Lap | 8 | 6 | 2 | 2 |
| Last Round | 10 | 7 | 3 | 2 |
| Last Stage | 10 | 7 | 3 | 2 |
| Lavishness | 10 | 7 | 3 | 3 |

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