Which to use
“flea” and “flue” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #16,711
- “flea” frequency rank
- #38,401
- “flue” frequency rank
- 55112
- confusion score
Side-by-Side Comparison
| Feature | flea | flue |
|---|---|---|
| Definition | A small, wingless, parasitic insect of the order Siphonaptera, renowned for its bloodsucking habits and jumping abilities. | A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace). |
Where the eye mixes flea and flue
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. flea and flue follow the identical consonant-vowel pattern (CCVV). Same shape at a glance is often the real trap, independent of shared letters.
Look-alike desk: flea vs flue
A purely visual mix-up. flea (/fliː/) and flue (/fluː/) 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 55112, derived from the frequency rank of both members and their visual similarity.
flea is recorded at frequency rank #16,711, classified as anoun, pronounced /fliː/. flue is at rank #38,401, tagged as anoun, pronounced /fluː/.
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 55112, this pair ranks #136,098 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of flea vs flue
Shared letters: efl. Private to "flea": a. Private to "flue": u.
"flea" · 4 letters · shape CCVV · "flue" · 4 letters · shape CCVV
Known mistypes of this pair
Frequently Asked Questions
Can "flea" and "flue" be used interchangeably?
Frequency check: "flea" vs "flue" - which ranks higher?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "flea" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "flue" - compare definitions side by side with the headword page. Word entry
- This pair ranks #136,098 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "flea" and "flue" 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 #136,098 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.