Which to use
“flue” and “flux” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #38,401
- “flue” frequency rank
- #13,518
- “flux” frequency rank
- 51919
- confusion score
Side-by-Side Comparison
| Feature | flue | flux |
|---|---|---|
| Definition | A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace). | The act of flowing; a continuous moving on or passing by, as of a flowing stream. |
Where the spellings diverge
Shared letters are muted; the letters that actually set flue and flux apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
flue and flux form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by a single letter - e in “flue” becomes x in “flux” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 51919, 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/. flux is at rank #13,518, tagged as anoun, pronounced /flʌks/.
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 51919, this pair ranks #161,389 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Frequency comparison
Frequently Asked Questions
Can "flue" and "flux" be used interchangeably?
Remembering flue vs flux
The fastest way to pick the right one every time.
- Read both glosses above and match the meaning you intend, only context separates this pair.
- See each word in full, definition, IPA, etymology and its other confusables. Full “flue” entry
- Browse more pairs most likely to be confused. Most confusable