| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Air Raid Shelter | 16 | 10 | 6 | 4 |
| Air Tight | 9 | 6 | 3 | 2 |
| Airtight | 8 | 5 | 3 | 2 |
| Ballproof | 9 | 6 | 3 | 2 |
| Bombproof | 9 | 6 | 3 | 2 |
| Bomb Shelter | 12 | 9 | 3 | 3 |
| Bulletproof | 11 | 7 | 4 | 3 |
| Burglarproof | 12 | 8 | 4 | 3 |
| Corrosionproof | 14 | 8 | 6 | 4 |
| Dampproof | 9 | 6 | 3 | 2 |
| Fireproof | 9 | 5 | 4 | 3 |
| Fire Resisting | 14 | 9 | 5 | 5 |
| Flameproof | 10 | 6 | 4 | 3 |
| Foolproof | 9 | 5 | 4 | 2 |
| Gas Tight | 9 | 7 | 2 | 2 |
| Goof Proof | 10 | 6 | 4 | 2 |
| Goofproof | 9 | 5 | 4 | 2 |
| Hermetic | 8 | 5 | 3 | 3 |
| Holeproof | 9 | 5 | 4 | 3 |
| Impenetrable | 12 | 7 | 5 | 5 |
| Impermeable | 11 | 6 | 5 | 4 |
| Imperviable | 11 | 6 | 5 | 5 |
| Impervious | 10 | 5 | 5 | 4 |
| Impervious To | 13 | 7 | 6 | 5 |
| Ironclad | 8 | 5 | 3 | 3 |
| Leakproof | 9 | 5 | 4 | 2 |
| Noiseproof | 10 | 5 | 5 | 3 |
| Nonpuncturable | 14 | 9 | 5 | 5 |
| Proof | 5 | 3 | 2 | 1 |
| Proof Against | 13 | 8 | 5 | 3 |
| Repellent | 9 | 6 | 3 | 3 |
| Resistant | 9 | 6 | 3 | 3 |
| Rustproof | 9 | 6 | 3 | 2 |
| Rustproofed | 11 | 7 | 4 | 3 |
| Shatterproof | 12 | 8 | 4 | 3 |
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