Which to use
“ferment” is a noun and “filment” is a verb - they look or sound alike but fill different roles in a sentence.
- #11,049
- “ferment” frequency rank
- #38,297
- “filment” frequency rank
- 49346
- confusion score
Side-by-Side Comparison
| Feature | ferment | filment |
|---|---|---|
| Definition | Ensemble d’êtres microscopiques vivant et se développant aux dépens de certaines matières organiques dont ils provoquent la destruction moléculaire. | Troisième personne du pluriel du présent de l’indicatif de filmer. |
Where the eye mixes ferment and filment
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence. ferment and filment follow the identical consonant-vowel pattern (CVCCVCC). Same shape at a glance is often the real trap, independent of shared letters.
Why the eye confuses ferment with filment
These two trip readers on the page rather than in the ear: ferment is \fɛʁ.mɑ̃\ while filment is \film\. 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 verb), which is usually the fastest check. Our composite confusion score for this pair is 49346, derived from the frequency rank of both members and their visual similarity.
ferment is recorded at frequency rank #11,049, classified as anoun, pronounced \fɛʁ.mɑ̃\. filment is at rank #38,297, tagged as averb, pronounced \film\.
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 49346, this pair ranks #171,440 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of ferment vs filment
Shared letters: efmnt. Private to "ferment": r. Private to "filment": il.
"ferment" · 7 letters · shape CVCCVCC · "filment" · 7 letters · shape CVCCVCC
Known mistypes of this pair
Frequently Asked Questions
Can "ferment" and "filment" be used interchangeably?
In ordinary French text, does "ferment" or "filment" show up more?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "ferment" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "filment" - compare definitions side by side with the headword page. Word entry
- This pair ranks #171,440 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "ferment" and "filment" also get mixed up with nearby pairs, the highest-scored neighbour is "filmant vs filment". 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 #171,440 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.