All Words: billionth, millionth, trillionth, quadrillionth, and quintillionth
| Word | Length | Vowels | Syllables | |||
|---|---|---|---|---|---|---|
| Billionth | 9 | 6 | 3 | 2 | ||
| Millionth | 9 | 6 | 3 | 2 | ||
| Trillionth | 10 | 7 | 3 | 2 | ||
| Quadrillionth | 13 | 8 | 5 | 3 | ||
| Quintillionth | 13 | 8 | 5 | 3 |
Suffix: -ionth. List of words that end in ionth.

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