Which to use
“ils” is a pronoun and “ISF” is a name - they look or sound alike but fill different roles in a sentence.
- #54
- “ils” frequency rank
- #17,462
- “ISF” frequency rank
- 17516
- confusion score
Side-by-Side Comparison
| Feature | ils | ISF |
|---|---|---|
| Definition | Pronom clitique de la troisième personne du pluriel sujet, quand on parle d’un groupe d’hommes et de femmes ou de choses grammaticalement masculines et féminines. | 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 ils and ISF
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: ils vs ISF
These two trip readers on the page rather than in the ear: ils is \il\ while ISF is \i ɛ.s‿ɛf\. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (pronoun vs name), which is usually the fastest check. Our composite confusion score for this pair is 17516, derived from the frequency rank of both members and their visual similarity.
ils is recorded at frequency rank #54, classified as apron, pronounced \il\. 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 17516, this pair ranks #382,789 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of ils vs ISF
Shared letters: is. Private to "ils": l. Private to "ISF": f.
"ils" · 3 letters · shape VCC · "ISF" · 3 letters · shape VCC
Frequently Asked Questions
Is swapping "ils" for "ISF" ever safe?
Which is more common, "ils" 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 "ils" 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 #382,789 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "ils" and "ISF" also get mixed up with nearby pairs, the highest-scored neighbour is "ISF vs isi". Nearby pair
Confusion rank #382,789 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.