Which to use
“fossa” and “fossil” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #48,755
- “fossa” frequency rank
- #7,228
- “fossil” frequency rank
- 55983
- confusion score
Side-by-Side Comparison
| Feature | fossa | fossil |
|---|---|---|
| Definition | A pit, groove, cavity, or depression. | The mineralized remains of an animal or plant. |
Where the eye mixes fossa and fossil
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. fossa runs 5 letters (CVCCV) against fossil's 6 (CVCCVC) - the length gap alone is often enough to separate them once you know to check it.
Look-alike desk: fossa vs fossil
A purely visual mix-up. fossa (/ˈfɒsə/) and fossil (/ˈfɒsl̩/) 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 1 letter(s) in length. Our composite confusion score for this pair is 55983, derived from the frequency rank of both members and their visual similarity.
fossa is recorded at frequency rank #48,755, classified as anoun, pronounced /ˈfɒsə/. fossil is at rank #7,228, tagged as anoun, pronounced /ˈfɒsl̩/.
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 55983, this pair ranks #129,535 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of fossa vs fossil
Shared letters: fos. Private to "fossa": a. Private to "fossil": il.
"fossa" · 5 letters · shape CVCCV · "fossil" · 6 letters · shape CVCCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "fossa" for "fossil" ever safe?
Which is more common, "fossa" or "fossil"?
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 "fossa" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fossil" - compare definitions side by side with the headword page. Word entry
- This pair ranks #129,535 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "fossa" and "fossil" also get mixed up with nearby pairs, the highest-scored neighbour is "fess vs fossa". 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 #129,535 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.