Which to use
“flue” is a noun and “FTSE” is a name - they look or sound alike but fill different roles in a sentence.
- #38,401
- “flue” frequency rank
- #38,851
- “FTSE” frequency rank
- 77252
- confusion score
Side-by-Side Comparison
| Feature | flue | FTSE |
|---|---|---|
| Definition | A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace). | Financial Times and Stock Exchange. |
Where the eye mixes flue and FTSE
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. flue (CCVV) and FTSE (CCCV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Why the eye confuses flue with FTSE
These two trip readers on the page rather than in the ear: flue is /fluː/ while FTSE is /ˈfʊt.si/. 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 (noun vs name), which is usually the fastest check. Our composite confusion score for this pair is 77252, 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/. FTSE is at rank #38,851, tagged as aname, pronounced /ˈfʊt.si/.
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 77252, this pair ranks #27,767 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of flue vs FTSE
Shared letters: ef. Private to "flue": lu. Private to "FTSE": st.
"flue" · 4 letters · shape CCVV · "FTSE" · 4 letters · shape CCCV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "flue" for "FTSE" ever safe?
Which is more common, "flue" or "FTSE"?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "flue" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "FTSE" - compare definitions side by side with the headword page. Word entry
- This pair ranks #27,767 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "flue" and "FTSE" 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 #27,767 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.