Which to use
“fou” is an adjective and “frog” is a noun - they look or sound alike but fill different roles in a sentence.
- #1,063
- “fou” frequency rank
- #42,890
- “frog” frequency rank
- 43953
- confusion score
Side-by-Side Comparison
| Feature | fou | frog |
|---|---|---|
| Definition | Qualifie une personne qui a perdu la raison, qui est atteinte d’aliénation mentale. | Surnom dont des Canadiens non francophones affublent les Québécois francophones. |
Where the eye mixes fou and frog
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: fou vs frog
These two trip readers on the page rather than in the ear: fou is \fu\ while frog is \fɹɒɡ\. 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 (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 43953, derived from the frequency rank of both members and their visual similarity.
fou is recorded at frequency rank #1,063, classified as anadj, pronounced \fu\. frog is at rank #42,890, tagged as anoun, pronounced \fɹɒɡ\.
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 43953, this pair ranks #214,124 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fou vs frog
Shared letters: fo. Private to "fou": u. Private to "frog": gr.
"fou" · 3 letters · shape CVV · "frog" · 4 letters · shape CCVC
Known mistypes of this pair
- frog ← ffrog · forg · frgo · frogg · frrog · rfog
Frequently Asked Questions
Do "fou" and "frog" mean the same thing in a sentence?
In ordinary French text, does "fou" or "frog" show up more?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "fou" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "frog" - compare definitions side by side with the headword page. Word entry
- This pair ranks #214,124 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "fou" and "frog" also get mixed up with nearby pairs, the highest-scored neighbour is "fog vs frog". 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 #214,124 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.