Which to use
“impact” is a noun and “impair” is an adjective - they look or sound alike but fill different roles in a sentence.
- #1,818
- “impact” frequency rank
- #25,687
- “impair” frequency rank
- 27505
- confusion score
Side-by-Side Comparison
| Feature | impact | impair |
|---|---|---|
| Definition | Choc d’un projectile contre un corps. | Qui n’est pas pair, qui n’est pas divisible par deux, en parlant d’un nombre entier. |
Where the spellings diverge
Shared letters are muted; the letters that actually set impact and impair apart are highlighted. They share 4 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: impact is \ɛ̃.pakt\ while impair is \ɛ̃.pɛʁ\. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 27505, derived from the frequency rank of both members and their visual similarity.
impact is recorded at frequency rank #1,818, classified as anoun, pronounced \ɛ̃.pakt\. impair is at rank #25,687, tagged as anadj, pronounced \ɛ̃.pɛʁ\.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 27505, this pair ranks #328,545 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of impact vs impair
Shared letters: aimp. Private to "impact": ct. Private to "impair": r.
"impact" · 6 letters · shape VCCVCC · "impair" · 6 letters · shape VCCVVC
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "impact" and "impair" be used interchangeably?
Which is more common, "impact" or "impair"?
Remembering impact vs impair
The fastest way to pick the right one every time.
- Check the role first: if you need a noun, it's “impact”; for an adjective, it's “impair”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “impact” entry
- Browse more pairs most likely to be confused. Most confusable