Which to use
“perf” is an adjective and “peri” is a noun - they look or sound alike but fill different roles in a sentence.
- #42,815
- “perf” frequency rank
- #29,415
- “peri” frequency rank
- 72230
- confusion score
Side-by-Side Comparison
| Feature | perf | peri |
|---|---|---|
| Definition | Abbreviation of perforated; when followed by a number, eg, perf 14, this indicates the number of perforations per two centimetres. | A sprite or supernatural being. |
Where the spellings diverge
Shared letters are muted; the letters that actually set perf and peri apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: perf is /pɜː(ɹ)f/ while peri is /ˈpɪə.ɹi/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - f in “perf” becomes i in “peri”, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 72230, derived from the frequency rank of both members and their visual similarity.
perf is recorded at frequency rank #42,815, classified as anadj, pronounced /pɜː(ɹ)f/. peri is at rank #29,415, tagged as anoun, pronounced /ˈpɪə.ɹi/.
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 72230, this pair ranks #43,760 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of perf vs peri
Shared letters: epr. Private to "perf": f. Private to "peri": i.
"perf" · 4 letters · shape CVCC · "peri" · 4 letters · shape CVCV
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "perf" and "peri" be used interchangeably?
Which is more common, "perf" or "peri"?
Remembering perf vs peri
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “perf”; for a noun, it's “peri”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “perf” entry
- Browse more pairs most likely to be confused. Most confusable