Which to use
“flue” and “fume” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #38,401
- “flue” frequency rank
- #45,384
- “fume” frequency rank
- 83785
- confusion score
Side-by-Side Comparison
| Feature | flue | fume |
|---|---|---|
| Definition | A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace). | A gas or vapour/vapor that is strong-smelling or dangerous to inhale. |
Where the eye mixes flue and fume
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. flue (CCVV) and fume (CVCV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Visual trap between flue and fume
A purely visual mix-up. flue (/fluː/) and fume (/fjuːm/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 83785, 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/. fume is at rank #45,384, tagged as anoun, pronounced /fjuːm/.
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 83785, this pair ranks #13,169 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of flue vs fume
Shared letters: efu. Private to "flue": l. Private to "fume": m.
"flue" · 4 letters · shape CCVV · "fume" · 4 letters · shape CVCV
Known mistypes of this pair
Frequently Asked Questions
Do "flue" and "fume" mean the same thing in a sentence?
Frequency check: "flue" vs "fume" - which ranks higher?
After this comparison
Eye-level mix-up between "flue" and "fume" 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 "fume" - compare definitions side by side with the headword page. Word entry
- This pair ranks #13,169 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "flue" and "fume" also get mixed up with nearby pairs, the highest-scored neighbour is "FOMO vs fume". 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 #13,169 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.