Which to use
“iso” is a noun and “issu” is an adjective - they look or sound alike but fill different roles in a sentence.
- #12,181
- “iso” frequency rank
- #4,769
- “issu” frequency rank
- 16950
- confusion score
Side-by-Side Comparison
| Feature | iso | issu |
|---|---|---|
| Definition | Plan isométrique. | Né (d’une personne, d’une lignée ou d’une race), descendant. |
Where the eye mixes iso and issu
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses iso with issu
These two trip readers on the page rather than in the ear: iso is \i.zo\ while issu is \i.sy\. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 16950, derived from the frequency rank of both members and their visual similarity.
iso is recorded at frequency rank #12,181, classified as anoun, pronounced \i.zo\. issu is at rank #4,769, tagged as anadj, pronounced \i.sy\.
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 16950, this pair ranks #385,499 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of iso vs issu
Shared letters: is. Private to "iso": o. Private to "issu": u.
"iso" · 3 letters · shape VCV · "issu" · 4 letters · shape VCCV
Known mistypes of this pair
- issu ← isu · sisu
Frequently Asked Questions
Is swapping "iso" for "issu" ever safe?
In ordinary French text, does "iso" or "issu" show up more?
Useful next steps
Eye-level mix-up between "iso" and "issu" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "iso" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "issu" - compare definitions side by side with the headword page. Word entry
- This pair ranks #385,499 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "iso" and "issu" also get mixed up with nearby pairs, the highest-scored neighbour is "isi vs iso". 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 #385,499 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.