Which to use
“peng” is a noun and “perf” is an adjective - they look or sound alike but fill different roles in a sentence.
- #22,173
- “peng” frequency rank
- #42,815
- “perf” frequency rank
- 64988
- confusion score
Side-by-Side Comparison
| Feature | peng | perf |
|---|---|---|
| Definition | A legendary enormous bird. | Abbreviation of perforated; when followed by a number, eg, perf 14, this indicates the number of perforations per two centimetres. |
Where the eye mixes peng and perf
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between peng and perf
These two trip readers on the page rather than in the ear: peng is /pɛŋ/ while perf is /pɜː(ɹ)f/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 64988, derived from the frequency rank of both members and their visual similarity.
peng is recorded at frequency rank #22,173, classified as anoun, pronounced /pɛŋ/. perf is at rank #42,815, tagged as anadj, pronounced /pɜː(ɹ)f/.
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 64988, this pair ranks #74,981 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of peng vs perf
Shared letters: ep. Private to "peng": gn. Private to "perf": fr.
"peng" · 4 letters · shape CVCC · "perf" · 4 letters · shape CVCC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "peng" for "perf" ever safe?
Frequency check: "peng" vs "perf" - which ranks higher?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "peng" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "perf" - compare definitions side by side with the headword page. Word entry
- This pair ranks #74,981 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "peng" and "perf" also get mixed up with nearby pairs, the highest-scored neighbour is "pecs vs perf". 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 #74,981 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.