Which to use
“RSF” and “RTT” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #44,703
- “RSF” frequency rank
- #33,874
- “RTT” frequency rank
- 78577
- confusion score
Side-by-Side Comparison
| Feature | RSF | RTT |
|---|---|---|
| Definition | Abréviation de réacteur à sels fondus. | Politique mise en place en France sous le gouvernement de Lionel Jospin visant à réduire la durée hebdomadaire de travail afin de créer des emplois et de relancer l’économie en France. |
Where the eye mixes RSF and RTT
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Why the eye confuses RSF with RTT
A purely visual mix-up. RSF (\ɛ.ʁɛ.sɛf\) and RTT (\ɛʁ te te\) 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 78577, derived from the frequency rank of both members and their visual similarity.
RSF is recorded at frequency rank #44,703, classified as anoun, pronounced \ɛ.ʁɛ.sɛf\. RTT is at rank #33,874, tagged as anoun, pronounced \ɛʁ te te\.
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 78577, this pair ranks #25,389 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of RSF vs RTT
Shared letters: r. Private to "RSF": fs. Private to "RTT": t.
"RSF" · 3 letters · shape CCC · "RTT" · 3 letters · shape CCC
Frequently Asked Questions
Is swapping "RSF" for "RTT" ever safe?
In ordinary French text, does "RSF" or "RTT" show up more?
Useful next steps
Eye-level mix-up between "RSF" and "RTT" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "RSF" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "RTT" - compare definitions side by side with the headword page. Word entry
- This pair ranks #25,389 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "RSF" and "RTT" also get mixed up with nearby pairs, the highest-scored neighbour is "rog vs RSF". Nearby pair
Confusion rank #25,389 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.