Which to use
“fallu” is a verb and “filou” is a noun - they look or sound alike but fill different roles in a sentence.
- #3,331
- “fallu” frequency rank
- #43,438
- “filou” frequency rank
- 46769
- confusion score
Side-by-Side Comparison
| Feature | fallu | filou |
|---|---|---|
| Definition | Participe passé de falloir. | (Louisiane) Voleur agissant par ruse, tricheur au jeu, personne qui abuse de la confiance. |
Where the eye mixes fallu and filou
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Why the eye confuses fallu with filou
These two trip readers on the page rather than in the ear: fallu is \fa.ly\ while filou is \fi.lu\. 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 (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 46769, derived from the frequency rank of both members and their visual similarity.
fallu is recorded at frequency rank #3,331, classified as averb, pronounced \fa.ly\. filou is at rank #43,438, tagged as anoun, pronounced \fi.lu\.
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 46769, this pair ranks #192,234 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fallu vs filou
Shared letters: flu. Private to "fallu": a. Private to "filou": io.
"fallu" · 5 letters · shape CVCCV · "filou" · 5 letters · shape CVCVV
Known mistypes of this pair
Frequently Asked Questions
Do "fallu" and "filou" mean the same thing in a sentence?
Frequency check: "fallu" vs "filou" - which ranks higher?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "fallu" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "filou" - compare definitions side by side with the headword page. Word entry
- This pair ranks #192,234 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "fallu" and "filou" also get mixed up with nearby pairs, the highest-scored neighbour is "filez vs filou". 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 #192,234 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.