Which to use
“flu” and “foo” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #7,564
- “flu” frequency rank
- #18,562
- “foo” frequency rank
- 26126
- confusion score
Side-by-Side Comparison
| Feature | flu | foo |
|---|---|---|
| Definition | Influenza. | Alternative form of fu: an administrative subdivision of imperial China; the capital of such divisions. |
Where the spellings diverge
Shared letters are muted; the letters that actually set flu and foo apart are highlighted. They share 1 letter in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
flu and foo form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They share most of their letters but differ in 2 positions - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 26126, 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/. foo is at rank #18,562, tagged as anoun, pronounced /fuː/.
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 26126, this pair ranks #389,023 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Frequency comparison
Frequently Asked Questions
Can "flu" and "foo" be used interchangeably?
Remembering flu vs foo
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 “flu” entry
- Browse more pairs most likely to be confused. Most confusable