feu vs flu, What's the Difference?

Which to use

“feu” and “flu” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#43,641
“feu” frequency rank: #7,564
“flu” frequency rank: 51205
confusion score

Side-by-Side Comparison

Feature	feu	flu
Definition	Land held in feudal tenure.	Influenza.

Where the eye mixes feu and flu

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

3 ch

feu

3 ch

flu

Spelling & Dictionary Insight

A purely visual mix-up. feu (/fjuː/) and flu (/fluː/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - e in “feu” becomes l in “flu”. Our composite confusion score for this pair is 51205, derived from the frequency rank of both members and their visual similarity.

feu is recorded at frequency rank #43,641, classified as anoun, pronounced /fjuː/. flu is at rank #7,564, 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 51205, this pair ranks #167,447 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of feu vs flu

Shared letters: fu. Private to "feu": e. Private to "flu": l.

"feu" · 3 letters · shape CVV · "flu" · 3 letters · shape CCV

Frequently Asked Questions

Can "feu" and "flu" be used interchangeably?

No. They are said differently (/fjuː/ versus /fluː/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

Which is more common, "feu" or "flu"?

"flu" is the more common of the two: it sits at frequency rank #7,564 in our English list, against #43,641 for "feu". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

You've compared "feu" and "flu". Here's where to go from here.

Full dictionary entry for "feu" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "flu" - compare definitions side by side with the headword page. Word entry
This pair ranks #167,447 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"feu" and "flu" also get mixed up with nearby pairs, the highest-scored neighbour is "feu vs foh". Nearby pair

PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.