Which to use
“fioul” is a noun and “flous” is an adjective - they look or sound alike but fill different roles in a sentence.
- #27,065
- “fioul” frequency rank
- #30,613
- “flous” frequency rank
- 57678
- confusion score
Side-by-Side Comparison
| Feature | fioul | flous |
|---|---|---|
| Definition | Distillat lourd du pétrole, utilisé comme combustible pour des installations de chauffage domestiques ou industrielles, comme carburant pour les gros moteurs diesels. | Masculin pluriel de flou. |
Where the eye mixes fioul and flous
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. fioul (CVVVC) and flous (CCVVC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Why the eye confuses fioul with flous
These two trip readers on the page rather than in the ear: fioul is \fjul\ while flous is \flu\. 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 (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 57678, derived from the frequency rank of both members and their visual similarity.
fioul is recorded at frequency rank #27,065, classified as anoun, pronounced \fjul\. flous is at rank #30,613, tagged as anadj, pronounced \flu\.
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 57678, this pair ranks #113,583 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fioul vs flous
Shared letters: flou. Private to "fioul": i. Private to "flous": s.
"fioul" · 5 letters · shape CVVVC · "flous" · 5 letters · shape CCVVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "fioul" for "flous" ever safe?
Which is more common, "fioul" or "flous"?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "fioul" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "flous" - compare definitions side by side with the headword page. Word entry
- This pair ranks #113,583 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "fioul" and "flous" also get mixed up with nearby pairs, the highest-scored neighbour is "flour vs flous". 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 #113,583 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.