Which to use
“fosse” is a noun and “foster” is a verb - they look or sound alike but fill different roles in a sentence.
- #7,964
- “fosse” frequency rank
- #17,141
- “foster” frequency rank
- 25105
- confusion score
Side-by-Side Comparison
| Feature | fosse | foster |
|---|---|---|
| Definition | Cavité dans le sol, le plus souvent artificielle. | Alimenter, nourrir. |
Where the eye mixes fosse and foster
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. fosse runs 5 letters (CVCCV) against foster's 6 (CVCCVC) - the length gap alone is often enough to separate them once you know to check it.
Visual trap between fosse and foster
These two trip readers on the page rather than in the ear: fosse is \fos\ while foster is \ˈfɒs.tə\. 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 25105, derived from the frequency rank of both members and their visual similarity.
fosse is recorded at frequency rank #7,964, classified as anoun, pronounced \fos\. foster is at rank #17,141, tagged as averb, pronounced \ˈfɒs.tə\.
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 25105, this pair ranks #342,782 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of fosse vs foster
Shared letters: efos. Private to "fosse": -. Private to "foster": rt.
"fosse" · 5 letters · shape CVCCV · "foster" · 6 letters · shape CVCCVC
Known mistypes of this pair
Frequently Asked Questions
Can "fosse" and "foster" be used interchangeably?
Frequency check: "fosse" vs "foster" - which ranks higher?
After this comparison
Eye-level mix-up between "fosse" and "foster" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "fosse" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "foster" - compare definitions side by side with the headword page. Word entry
- This pair ranks #342,782 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "fosse" and "foster" also get mixed up with nearby pairs, the highest-scored neighbour is "fontes vs foster". 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 #342,782 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.