Which to use
“io” and “iso” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #23,588
- “io” frequency rank
- #12,181
- “iso” frequency rank
- 35769
- confusion score
Side-by-Side Comparison
| Feature | io | iso |
|---|---|---|
| Definition | Septième lettre de l’alphabet cyrillique, ё. | Plan isométrique. |
Where the eye mixes io and iso
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between io and iso
A purely visual mix-up. io (\jo\) and iso (\i.zo\) 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 35769, derived from the frequency rank of both members and their visual similarity.
io is recorded at frequency rank #23,588, classified as anoun, pronounced \jo\. iso is at rank #12,181, tagged as anoun, pronounced \i.zo\.
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 35769, this pair ranks #274,370 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of io vs iso
Shared letters: io. Private to "io": -. Private to "iso": s.
"io" · 2 letters · shape VV · "iso" · 3 letters · shape VCV
Frequently Asked Questions
Can "io" and "iso" be used interchangeably?
Which is more common, "io" or "iso"?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "io" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "iso" - compare definitions side by side with the headword page. Word entry
- This pair ranks #274,370 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "io" and "iso" also get mixed up with nearby pairs, the highest-scored neighbour is "io vs isi". Nearby pair
Confusion rank #274,370 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.