Which to use
“F1” and “fo” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #9,656
- “F1” frequency rank
- #9,484
- “fo” frequency rank
- 19140
- confusion score
Side-by-Side Comparison
| Feature | F1 | fo |
|---|---|---|
| Definition | Formule 1. | Folio. |
Where the eye mixes F1 and fo
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Visual trap between F1 and fo
A purely visual mix-up. F1 (\ɛf.œ̃\) and fo (\fɔ.ljo\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - 1 in “F1” becomes o in “fo”. Our composite confusion score for this pair is 19140, derived from the frequency rank of both members and their visual similarity.
F1 is recorded at frequency rank #9,656, classified as anoun, pronounced \ɛf.œ̃\. fo is at rank #9,484, tagged as anoun, pronounced \fɔ.ljo\.
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 19140, this pair ranks #374,774 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of F1 vs fo
Shared letters: f. Private to "F1": -. Private to "fo": o.
"F1" · 1 letters · shape C · "fo" · 2 letters · shape CV
Frequently Asked Questions
Do "F1" and "fo" mean the same thing in a sentence?
Frequency check: "F1" vs "fo" - which ranks higher?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "F1" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fo" - compare definitions side by side with the headword page. Word entry
- This pair ranks #374,774 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "F1" and "fo" also get mixed up with nearby pairs, the highest-scored neighbour is "F1 vs Fee". Nearby pair
Confusion rank #374,774 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.