Which to use
“flack” and “flank” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #30,799
- “flack” frequency rank
- #12,241
- “flank” frequency rank
- 43040
- confusion score
Side-by-Side Comparison
| Feature | flack | flank |
|---|---|---|
| Definition | To flutter; palpitate. | To attack the flank(s) of. |
Where the eye mixes flack and flank
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Why the eye confuses flack with flank
A purely visual mix-up. flack (/flæk/) and flank (/ˈflæŋk/) 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 - c in “flack” becomes n in “flank”. Our composite confusion score for this pair is 43040, derived from the frequency rank of both members and their visual similarity.
flack is recorded at frequency rank #30,799, classified as averb, pronounced /flæk/. flank is at rank #12,241, tagged as averb, pronounced /ˈflæŋk/.
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 43040, this pair ranks #243,758 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of flack vs flank
Shared letters: afkl. Private to "flack": c. Private to "flank": n.
"flack" · 5 letters · shape CCVCC · "flank" · 5 letters · shape CCVCC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "flack" for "flank" ever safe?
Frequency check: "flack" vs "flank" - which ranks higher?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "flack" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "flank" - compare definitions side by side with the headword page. Word entry
- This pair ranks #243,758 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "flack" and "flank" also get mixed up with nearby pairs, the highest-scored neighbour is "flack vs flail". 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 #243,758 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.