Which to use
“fuel” is a noun and “fui” is a verb - they look or sound alike but fill different roles in a sentence.
- #26,015
- “fuel” frequency rank
- #9,318
- “fui” frequency rank
- 35333
- confusion score
Side-by-Side Comparison
| Feature | fuel | fui |
|---|---|---|
| Definition | Variante orthographique de fioul | Participe passé masculin singulier de fuir. |
Where the eye mixes fuel and fui
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses fuel with fui
These two trip readers on the page rather than in the ear: fuel is \fjul\ while fui is \fɥi\. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs verb), which is usually the fastest check. Our composite confusion score for this pair is 35333, derived from the frequency rank of both members and their visual similarity.
fuel is recorded at frequency rank #26,015, classified as anoun, pronounced \fjul\. fui is at rank #9,318, tagged as averb, pronounced \fɥi\.
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 35333, this pair ranks #277,465 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fuel vs fui
Shared letters: fu. Private to "fuel": el. Private to "fui": i.
"fuel" · 4 letters · shape CVVC · "fui" · 3 letters · shape CVV
Known mistypes of this pair
- fuel ← feul · ffuel · fuell · fule · ufel
Frequently Asked Questions
Can "fuel" and "fui" be used interchangeably?
Which is more common, "fuel" or "fui"?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "fuel" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fui" - compare definitions side by side with the headword page. Word entry
- This pair ranks #277,465 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "fuel" and "fui" also get mixed up with nearby pairs, the highest-scored neighbour is "Fee vs fuel". 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 #277,465 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.