Which to use
“ir” is a verb and “ISF” is a name - they look or sound alike but fill different roles in a sentence.
- #14,065
- “ir” frequency rank
- #17,462
- “ISF” frequency rank
- 31527
- confusion score
Side-by-Side Comparison
| Feature | ir | ISF |
|---|---|---|
| Definition | Aller, se déplacer jusqu'à un endroit. | 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. |
Where the eye mixes ir and ISF
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Why the eye confuses ir with ISF
These two trip readers on the page rather than in the ear: ir is \iɾ\ while ISF is \i ɛ.s‿ɛf\. 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 (verb vs name), which is usually the fastest check. Our composite confusion score for this pair is 31527, derived from the frequency rank of both members and their visual similarity.
ir is recorded at frequency rank #14,065, classified as averb, pronounced \iɾ\. ISF is at rank #17,462, tagged as aname, pronounced \i ɛ.s‿ɛf\.
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 31527, this pair ranks #303,245 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of ir vs ISF
Shared letters: i. Private to "ir": r. Private to "ISF": fs.
"ir" · 2 letters · shape VC · "ISF" · 3 letters · shape VCC
Frequently Asked Questions
Do "ir" and "ISF" mean the same thing in a sentence?
Which is more common, "ir" or "ISF"?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "ir" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ISF" - compare definitions side by side with the headword page. Word entry
- This pair ranks #303,245 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "ir" and "ISF" also get mixed up with nearby pairs, the highest-scored neighbour is "ISF vs isi". Nearby pair
Confusion rank #303,245 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.