Which to use
“ssi” is a conjunction and “su” is a verb - they look or sound alike but fill different roles in a sentence.
- #42,065
- “ssi” frequency rank
- #1,609
- “su” frequency rank
- 43674
- confusion score
Side-by-Side Comparison
| Feature | ssi | su |
|---|---|---|
| Definition | Abréviation de si et seulement si. | Participe passé masculin singulier du verbe savoir. |
Where the eye mixes ssi and su
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Visual trap between ssi and su
These two trip readers on the page rather than in the ear: ssi is \si e sœl.mɑ̃ si\ while su is \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 (conjunction vs verb), which is usually the fastest check. Our composite confusion score for this pair is 43674, derived from the frequency rank of both members and their visual similarity.
ssi is recorded at frequency rank #42,065, classified as aconj, pronounced \si e sœl.mɑ̃ si\. su is at rank #1,609, tagged as averb, pronounced \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 43674, this pair ranks #216,296 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of ssi vs su
Shared letters: s. Private to "ssi": i. Private to "su": u.
"ssi" · 3 letters · shape CCV · "su" · 2 letters · shape CV
Frequently Asked Questions
Is swapping "ssi" for "su" ever safe?
In ordinary French text, does "ssi" or "su" show up more?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "ssi" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "su" - compare definitions side by side with the headword page. Word entry
- This pair ranks #216,296 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "ssi" and "su" also get mixed up with nearby pairs, the highest-scored neighbour is "ssi vs suu". Nearby pair
Confusion rank #216,296 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.