Which to use
“fill” is a verb and “fire” is a noun - they look or sound alike but fill different roles in a sentence.
- #2,297
- “fill” frequency rank
- #501
- “fire” frequency rank
- 2798
- confusion score
Side-by-Side Comparison
| Feature | fill | fire |
|---|---|---|
| Definition | To make full | A (usually self-sustaining) chemical reaction involving the bonding of oxygen with carbon or other fuel, with the production of heat and the presence of flame or smouldering. |
Where the eye mixes fill and fire
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: fill vs fire
These two trip readers on the page rather than in the ear: fill is /fɪl/ while fire is /ˈfaɪ.ə/. 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 (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 2798, derived from the frequency rank of both members and their visual similarity.
fill is recorded at frequency rank #2,297, classified as averb, pronounced /fɪl/. fire is at rank #501, tagged as anoun, pronounced /ˈfaɪ.ə/.
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 2798, this pair ranks #524,005 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of fill vs fire
Shared letters: fi. Private to "fill": l. Private to "fire": er.
"fill" · 4 letters · shape CVCC · "fire" · 4 letters · shape CVCV
Known mistypes of this pair
Frequently Asked Questions
Can "fill" and "fire" be used interchangeably?
Which is more common, "fill" or "fire"?
What to do next
Eye-level mix-up between "fill" and "fire" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "fill" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fire" - compare definitions side by side with the headword page. Word entry
- This pair ranks #524,005 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "fill" and "fire" also get mixed up with nearby pairs, the highest-scored neighbour is "Fars vs fire". 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 #524,005 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.