Which to use
“perf” is a noun and “pff” is an onomatopoeia - they look or sound alike but fill different roles in a sentence.
- #24,321
- “perf” frequency rank
- #26,468
- “pff” frequency rank
- 50789
- confusion score
Side-by-Side Comparison
| Feature | perf | pff |
|---|---|---|
| Definition | Performance. | Bruit de souffle. |
Where the eye mixes perf and pff
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses perf with pff
These two trip readers on the page rather than in the ear: perf is \pɛʁf\ while pff is \pf\. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs onomatopoeia), which is usually the fastest check. Our composite confusion score for this pair is 50789, derived from the frequency rank of both members and their visual similarity.
perf is recorded at frequency rank #24,321, classified as anoun, pronounced \pɛʁf\. pff is at rank #26,468, tagged as anonomatopoeia, pronounced \pf\.
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 50789, this pair ranks #159,976 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of perf vs pff
Shared letters: fp. Private to "perf": er. Private to "pff": -.
"perf" · 4 letters · shape CVCC · "pff" · 3 letters · shape CCC
Known mistypes of this pair
- perf ← eprf · pefr · perff · perrf · pperf · pref
Frequently Asked Questions
Do "perf" and "pff" mean the same thing in a sentence?
Frequency check: "perf" vs "pff" - which ranks higher?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "perf" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "pff" - compare definitions side by side with the headword page. Word entry
- This pair ranks #159,976 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "perf" and "pff" also get mixed up with nearby pairs, the highest-scored neighbour is "pff vs pio". 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 #159,976 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.