Which to use
“ISF” is a name and “isi” is a verb - they look or sound alike but fill different roles in a sentence.
- #17,462
- “ISF” frequency rank
- #49,170
- “isi” frequency rank
- 66632
- confusion score
Side-by-Side Comparison
| Feature | ISF | isi |
|---|---|---|
| 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. | Deuxième personne du singulier du futur de l’indicatif du verbe isal/isañ. |
Where the eye mixes ISF and isi
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: ISF is \i ɛ.s‿ɛf\ while isi is \ˈisːi\. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - f in “ISF” becomes i in “isi”, and the parts of speech differ too (name vs verb), which is usually the fastest check. Our composite confusion score for this pair is 66632, 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\. isi is at rank #49,170, tagged as averb, pronounced \ˈisːi\.
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 66632, this pair ranks #66,988 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of ISF vs isi
Shared letters: is. Private to "ISF": f. Private to "isi": -.
"ISF" · 3 letters · shape VCC · "isi" · 3 letters · shape VCV
Frequently Asked Questions
Can "ISF" and "isi" be used interchangeably?
Which is more common, "ISF" or "isi"?
What to do next
You've compared "ISF" and "isi". Here's where to go from here.
- Full dictionary entry for "ISF" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "isi" - compare definitions side by side with the headword page. Word entry
- This pair ranks #66,988 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "ISF" and "isi" also get mixed up with nearby pairs, the highest-scored neighbour is "ime vs isi". Nearby pair
PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.