Which to use
“reaction” and “reduction” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #30,770
- “reaction” frequency rank
- #30,773
- “reduction” frequency rank
- 61543
- confusion score
Side-by-Side Comparison
| Feature | reaction | reduction |
|---|---|---|
| Definition | Réaction. | Réduction, diminution. |
Where the eye mixes reaction and reduction
Muted = shared; highlighted = the visual trap. They share 7 letters in sequence.
Why the eye confuses reaction with reduction
A purely visual mix-up. reaction (\ɹiˈæk.ʃən\) and reduction (\ɹɪˈdʌk.ʃən\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 61543, derived from the frequency rank of both members and their visual similarity.
reaction is recorded at frequency rank #30,770, classified as anoun, pronounced \ɹiˈæk.ʃən\. reduction is at rank #30,773, tagged as anoun, pronounced \ɹɪˈdʌk.ʃən\.
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 61543, this pair ranks #91,690 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of reaction vs reduction
Shared letters: ceinort. Private to "reaction": a. Private to "reduction": du.
"reaction" · 8 letters · shape CVVCCVVC · "reduction" · 9 letters · shape CVCVCCVVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "reaction" for "reduction" ever safe?
Which is more common, "reaction" or "reduction"?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "reaction" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "reduction" - compare definitions side by side with the headword page. Word entry
- This pair ranks #91,690 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "reaction" and "reduction" also get mixed up with nearby pairs, the highest-scored neighbour is "reaction vs réfraction". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #91,690 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.