Which to use
“flak” and “flask” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #26,792
- “flak” frequency rank
- #22,379
- “flask” frequency rank
- 49171
- confusion score
Side-by-Side Comparison
| Feature | flak | flask |
|---|---|---|
| Definition | Ground-based anti-aircraft guns firing explosive shells. | 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 flak and flask
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. flak runs 4 letters (CCVC) against flask's 5 (CCVCC) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses flak with flask
A purely visual mix-up. flak (/flæk/) 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 49171, derived from the frequency rank of both members and their visual similarity.
flak is recorded at frequency rank #26,792, classified as anoun, pronounced /flæk/. 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 49171, this pair ranks #186,123 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of flak vs flask
Shared letters: afkl. Private to "flak": -. Private to "flask": s.
"flak" · 4 letters · shape CCVC · "flask" · 5 letters · shape CCVCC
Known mistypes of this pair
Frequently Asked Questions
Do "flak" and "flask" mean the same thing in a sentence?
In ordinary English text, does "flak" or "flask" show up more?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "flak" 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 #186,123 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "flak" and "flask" also get mixed up with nearby pairs, the highest-scored neighbour is "flak vs flaked". 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 #186,123 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.