Which to use
“flue” and “fun” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #38,401
- “flue” frequency rank
- #502
- “fun” frequency rank
- 38903
- confusion score
Side-by-Side Comparison
| Feature | flue | fun |
|---|---|---|
| Definition | A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace). | Amusement, enjoyment or pleasure. |
Where the eye mixes flue and fun
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses flue with fun
A purely visual mix-up. flue (/fluː/) and fun (/fʌn/) 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 38903, derived from the frequency rank of both members and their visual similarity.
flue is recorded at frequency rank #38,401, classified as anoun, pronounced /fluː/. fun is at rank #502, tagged as anoun, pronounced /fʌn/.
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 38903, this pair ranks #281,664 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of flue vs fun
Shared letters: fu. Private to "flue": el. Private to "fun": n.
"flue" · 4 letters · shape CCVV · "fun" · 3 letters · shape CVC
Known mistypes of this pair
- flue ← fflue · fleu · fllue · lfue
Frequently Asked Questions
Do "flue" and "fun" mean the same thing in a sentence?
Which is more common, "flue" or "fun"?
What to do next
Eye-level mix-up between "flue" and "fun" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "flue" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fun" - compare definitions side by side with the headword page. Word entry
- This pair ranks #281,664 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "flue" and "fun" also get mixed up with nearby pairs, the highest-scored neighbour is "flue vs fou". 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 #281,664 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.