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 spellings diverge
Shared letters are muted; the letters that actually set piston and poisson apart are highlighted. They share 5 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
piston and poisson form a confusable pair in the French index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by 1 letter(s) in length - close enough that the eye skips over the difference, far enough that meaning fully diverges. 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.
Frequency comparison
Frequently Asked Questions
Can "piston" and "poisson" be used interchangeably?
Remembering piston vs poisson
The fastest way to pick the right one every time.
- Read both glosses above and match the meaning you intend, only context separates this pair.
- See each word in full, definition, IPA, etymology and its other confusables. Full “piston” entry
- Browse more pairs most likely to be confused. Most confusable