Which to use
“ISF” is a name and “ix” is a verb - they look or sound alike but fill different roles in a sentence.
- #17,462
- “ISF” frequency rank
- #9,027
- “ix” frequency rank
- 26489
- confusion score
Side-by-Side Comparison
| Feature | ISF | ix |
|---|---|---|
| Definition | Impôt déclaratif payé par les personnes physiques, célibataires ou en couple, possédant un patrimoine imposable dont la valeur nette est supérieure à un seuil fixé par la loi. | Troisième personne du singulier du présent de l’indicatif de eixir. |
Where the eye mixes ISF and ix
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Why the eye confuses ISF with ix
These two trip readers on the page rather than in the ear: ISF is \i ɛ.s‿ɛf\ while ix is \ˈiʃ\. 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 (name vs verb), which is usually the fastest check. Our composite confusion score for this pair is 26489, derived from the frequency rank of both members and their visual similarity.
ISF is recorded at frequency rank #17,462, classified as aname, pronounced \i ɛ.s‿ɛf\. ix is at rank #9,027, tagged as averb, pronounced \ˈiʃ\.
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 26489, this pair ranks #334,684 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of ISF vs ix
Shared letters: i. Private to "ISF": fs. Private to "ix": x.
"ISF" · 3 letters · shape VCC · "ix" · 2 letters · shape VC
Frequently Asked Questions
Is swapping "ISF" for "ix" ever safe?
In ordinary French text, does "ISF" or "ix" show up more?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "ISF" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ix" - compare definitions side by side with the headword page. Word entry
- This pair ranks #334,684 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "ISF" and "ix" also get mixed up with nearby pairs, the highest-scored neighbour is "ISF vs isi". Nearby pair
Confusion rank #334,684 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.