- [X]v [Ion]N Suck- Suction, Donate- Donation, Compete- Competition
- [X]n [En]V Soft- Soften, Bright- Brighten, Tight- Tighten
- This would be grammatically incorrect as -ion words cannot transition to an -en word. It already ends in its own suffix. In order to add a suffix to a word to change its word form, it must be in its original form without a suffix already.
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