Which to use
“fidel” is an adjective and “fioul” is a noun - they look or sound alike but fill different roles in a sentence.
- #21,015
- “fidel” frequency rank
- #27,065
- “fioul” frequency rank
- 48080
- confusion score
Side-by-Side Comparison
| Feature | fidel | fioul |
|---|---|---|
| Definition | Gai, joyeux. | Distillat lourd du pétrole, utilisé comme combustible pour des installations de chauffage domestiques ou industrielles, comme carburant pour les gros moteurs diesels. |
Where the eye mixes fidel and fioul
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. fidel (CVCVC) and fioul (CVVVC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Why the eye confuses fidel with fioul
These two trip readers on the page rather than in the ear: fidel is \fiˑˈdeːl\ while fioul is \fjul\. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 48080, derived from the frequency rank of both members and their visual similarity.
fidel is recorded at frequency rank #21,015, classified as anadj, pronounced \fiˑˈdeːl\. fioul is at rank #27,065, tagged as anoun, pronounced \fjul\.
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 48080, this pair ranks #181,820 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fidel vs fioul
Shared letters: fil. Private to "fidel": de. Private to "fioul": ou.
"fidel" · 5 letters · shape CVCVC · "fioul" · 5 letters · shape CVVVC
Known mistypes of this pair
Frequently Asked Questions
Can "fidel" and "fioul" be used interchangeably?
Which is more common, "fidel" or "fioul"?
Useful next steps
Eye-level mix-up between "fidel" and "fioul" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "fidel" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fioul" - compare definitions side by side with the headword page. Word entry
- This pair ranks #181,820 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "fidel" and "fioul" also get mixed up with nearby pairs, the highest-scored neighbour is "fioul vs flour". 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 #181,820 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.