Which to use
“flu” is a noun and “fou” is an adjective - they look or sound alike but fill different roles in a sentence.
- #7,564
- “flu” frequency rank
- #48,244
- “fou” frequency rank
- 55808
- confusion score
Side-by-Side Comparison
| Feature | flu | fou |
|---|---|---|
| Definition | Influenza. | Drunk. |
Letter map: flu vs fou
Shared letters muted; letters that set flu and fou apart highlighted. Shared run: 2.
Role in the sentence - flu and fou
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: flu is anoun and fouanadjective. On the page they differ by a single letter - l in “flu” becomes o in “fou”. Our composite confusion score for this pair is 55808, derived from the frequency rank of both members and their visual similarity.
flu is recorded at frequency rank #7,564, classified as anoun, pronounced /fluː/. fou is at rank #48,244, tagged as anadj.
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 55808, this pair ranks #130,794 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of flu vs fou
Shared letters: fu. Private to "flu": l. Private to "fou": o.
"flu" · 3 letters · shape CCV · "fou" · 3 letters · shape CVV
Frequently Asked Questions
Do "flu" and "fou" mean the same thing in a sentence?
In ordinary English text, does "flu" or "fou" show up more?
After this comparison
Done with this confusable. These links stay specific to "flu" and "fou".
- Full dictionary entry for "flu" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fou" - compare definitions side by side with the headword page. Word entry
- This pair ranks #130,794 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "flu" and "fou" also get mixed up with nearby pairs, the highest-scored neighbour is "FOMO vs fou". Nearby pair
Confusion rank #130,794 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.