Which to use
“roy” and “RSF” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #3,220
- “roy” frequency rank
- #44,703
- “RSF” frequency rank
- 47923
- confusion score
Side-by-Side Comparison
| Feature | roy | RSF |
|---|---|---|
| Definition | De 1694 à 1740 : Orthographe de l’Académie française de roi. | Abréviation de réacteur à sels fondus. |
Where the eye mixes roy and RSF
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Why the eye confuses roy with RSF
A purely visual mix-up. roy (\ʁwa\) and RSF (\ɛ.ʁɛ.sɛf\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 47923, derived from the frequency rank of both members and their visual similarity.
roy is recorded at frequency rank #3,220, classified as anoun, pronounced \ʁwa\. RSF is at rank #44,703, tagged as anoun, pronounced \ɛ.ʁɛ.sɛf\.
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 47923, this pair ranks #183,065 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of roy vs RSF
Shared letters: r. Private to "roy": oy. Private to "RSF": fs.
"roy" · 3 letters · shape CVV · "RSF" · 3 letters · shape CCC
Frequently Asked Questions
Can "roy" and "RSF" be used interchangeably?
In ordinary French text, does "roy" or "RSF" show up more?
What to do next
Eye-level mix-up between "roy" and "RSF" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "roy" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "RSF" - compare definitions side by side with the headword page. Word entry
- This pair ranks #183,065 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "roy" and "RSF" also get mixed up with nearby pairs, the highest-scored neighbour is "rog vs RSF". Nearby pair
Confusion rank #183,065 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.