Which to use
“rachis” and “rais” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #49,307
- “rachis” frequency rank
- #37,509
- “rais” frequency rank
- 86816
- confusion score
Side-by-Side Comparison
| Feature | rachis | rais |
|---|---|---|
| Definition | Empilement de 33 ou 34 vertèbres, qui forment le support du dos des vertébrés et sur certaines desquelles sont fixées les côtes. | Ancienne orthographe de rai, figurant au Dictionnaire de l'Académie française jusqu’en 1878. |
Where the eye mixes rachis and rais
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. rachis runs 6 letters (CVCCVC) against rais's 4 (CVVC) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses rachis with rais
A purely visual mix-up. rachis (\ʁa.ʃis\) and rais (\ʁɛ\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 2 letter(s) in length. Our composite confusion score for this pair is 86816, derived from the frequency rank of both members and their visual similarity.
rachis is recorded at frequency rank #49,307, classified as anoun, pronounced \ʁa.ʃis\. rais is at rank #37,509, tagged as anoun, pronounced \ʁɛ\.
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 86816, this pair ranks #9,138 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of rachis vs rais
Shared letters: airs. Private to "rachis": ch. Private to "rais": -.
"rachis" · 6 letters · shape CVCCVC · "rais" · 4 letters · shape CVVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "rachis" for "rais" ever safe?
Frequency check: "rachis" vs "rais" - which ranks higher?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "rachis" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "rais" - compare definitions side by side with the headword page. Word entry
- This pair ranks #9,138 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "rachis" and "rais" also get mixed up with nearby pairs, the highest-scored neighbour is "rais vs Rhys". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #9,138 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.