Which to use
“fill” is an adverb and “fish” is a noun - they look or sound alike but fill different roles in a sentence.
- #38,807
- “fill” frequency rank
- #18,753
- “fish” frequency rank
- 57560
- confusion score
Side-by-Side Comparison
| Feature | fill | fish |
|---|---|---|
| Definition | Aussitôt, immédiatement, sitôt, tout de suite, d’abord. | Poisson. |
Where the eye mixes fill and fish
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between fill and fish
These two trip readers on the page rather than in the ear: fill is \ˈfiɫ\ while fish is \fɪʃ\. 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 (adverb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 57560, derived from the frequency rank of both members and their visual similarity.
fill is recorded at frequency rank #38,807, classified as anadv, pronounced \ˈfiɫ\. fish is at rank #18,753, tagged as anoun, pronounced \fɪʃ\.
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 57560, this pair ranks #114,299 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fill vs fish
Shared letters: fi. Private to "fill": l. Private to "fish": hs.
"fill" · 4 letters · shape CVCC · "fish" · 4 letters · shape CVCC
Known mistypes of this pair
Frequently Asked Questions
Can "fill" and "fish" be used interchangeably?
Which is more common, "fill" or "fish"?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "fill" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fish" - compare definitions side by side with the headword page. Word entry
- This pair ranks #114,299 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "fill" and "fish" also get mixed up with nearby pairs, the highest-scored neighbour is "filez vs fill". 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 #114,299 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.