Which to use
“flap” and “flask” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #15,170
- “flap” frequency rank
- #22,379
- “flask” frequency rank
- 37549
- confusion score
Side-by-Side Comparison
| Feature | flap | flask |
|---|---|---|
| Definition | Anything broad and flexible that hangs loose, or that is attached by one side or end and is easily moved. | A narrow-necked vessel of metal or glass, used for various purposes; as of sheet metal, to carry gunpowder in; or of wrought iron, to contain quicksilver; or of glass, to heat water in, etc. |
Where the eye mixes flap and flask
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Visual trap between flap and flask
A purely visual mix-up. flap (/flæp/) and flask (/ˈflɑːsk/) 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 1 letter(s) in length. Our composite confusion score for this pair is 37549, derived from the frequency rank of both members and their visual similarity.
flap is recorded at frequency rank #15,170, classified as anoun, pronounced /flæp/. flask is at rank #22,379, tagged as anoun, pronounced /ˈflɑːsk/.
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 37549, this pair ranks #293,622 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of flap vs flask
Shared letters: afl. Private to "flap": p. Private to "flask": ks.
"flap" · 4 letters · shape CCVC · "flask" · 5 letters · shape CCVCC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "flap" for "flask" ever safe?
Frequency check: "flap" vs "flask" - which ranks higher?
After this comparison
Eye-level mix-up between "flap" and "flask" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "flap" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "flask" - compare definitions side by side with the headword page. Word entry
- This pair ranks #293,622 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "flap" and "flask" also get mixed up with nearby pairs, the highest-scored neighbour is "flail vs flask". 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 #293,622 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.