Which to use
“flack” is a verb and “flock” is a noun - they look or sound alike but fill different roles in a sentence.
- #30,799
- “flack” frequency rank
- #11,384
- “flock” frequency rank
- 42183
- confusion score
Side-by-Side Comparison
| Feature | flack | flock |
|---|---|---|
| Definition | To flutter; palpitate. | A number of birds together in a group, such as those gathered together for the purpose of migration. |
Where the eye mixes flack and flock
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Visual trap between flack and flock
These two trip readers on the page rather than in the ear: flack is /flæk/ while flock is /flɒk/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - a in “flack” becomes o in “flock”, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 42183, 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/. flock is at rank #11,384, tagged as anoun, pronounced /flɒk/.
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 42183, this pair ranks #251,568 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of flack vs flock
Shared letters: cfkl. Private to "flack": a. Private to "flock": o.
"flack" · 5 letters · shape CCVCC · "flock" · 5 letters · shape CCVCC
Known mistypes of this pair
Frequently Asked Questions
Can "flack" and "flock" be used interchangeably?
Frequency check: "flack" vs "flock" - 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 "flock" - compare definitions side by side with the headword page. Word entry
- This pair ranks #251,568 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "flack" and "flock" 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 #251,568 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.