Which to use
“piston” and “poisson” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #18,560
- “piston” frequency rank
- #2,589
- “poisson” frequency rank
- 21149
- confusion score
Side-by-Side Comparison
| Feature | piston | poisson |
|---|---|---|
| Definition | Cylindre mobile dans le corps d’une pompe, organe de machine constitué par une cloison, mobile entre deux fluides à des pressions différentes, et destiné à transmettre un effort moteur. | Animal possédant un squelette, généralement ovipare (mais parfois ovovivipare ou vivipare), vivant dans l’eau, et respirant généralement par des branchies (bien que certaines espèces aient des systèmes de respiration aérienne complémentaire, comme les poumons des dipneustes ou le labyrinthe des anabantidés). |
Where the eye mixes piston and poisson
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence.
Look-alike desk: piston vs poisson
A purely visual mix-up. piston (\pis.tɔ̃\) and poisson (\pwa.sɔ̃\) 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 1 letter(s) in length. Our composite confusion score for this pair is 21149, derived from the frequency rank of both members and their visual similarity.
piston is recorded at frequency rank #18,560, classified as anoun, pronounced \pis.tɔ̃\. poisson is at rank #2,589, tagged as anoun, pronounced \pwa.sɔ̃\.
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 21149, this pair ranks #364,607 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of piston vs poisson
Shared letters: inops. Private to "piston": t. Private to "poisson": -.
"piston" · 6 letters · shape CVCCVC · "poisson" · 7 letters · shape CVVCCVC
Known mistypes of this pair
Frequently Asked Questions
Do "piston" and "poisson" mean the same thing in a sentence?
Frequency check: "piston" vs "poisson" - which ranks higher?
After this comparison
Eye-level mix-up between "piston" and "poisson" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "piston" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "poisson" - compare definitions side by side with the headword page. Word entry
- This pair ranks #364,607 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "piston" and "poisson" also get mixed up with nearby pairs, the highest-scored neighbour is "pinson vs piston". 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 #364,607 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.