Which to use
“perf” is an adjective and “petra” is a noun - they look or sound alike but fill different roles in a sentence.
- #42,815
- “perf” frequency rank
- #20,457
- “petra” frequency rank
- 63272
- confusion score
Side-by-Side Comparison
| Feature | perf | petra |
|---|---|---|
| Definition | Abbreviation of perforated; when followed by a number, eg, perf 14, this indicates the number of perforations per two centimetres. | stone, a weight equal to 14 pounds. |
Letter map: perf vs petra
Shared letters muted; letters that set perf and petra apart highlighted. Shared run: 3.
Grammar separator: perf vs petra
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: perf is anadjective and petraanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 63272, 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/. petra is at rank #20,457, tagged as anoun.
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 63272, this pair ranks #83,880 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of perf vs petra
Shared letters: epr. Private to "perf": f. Private to "petra": at.
"perf" · 4 letters · shape CVCC · "petra" · 5 letters · shape CVCCV
Known mistypes of this pair
Frequently Asked Questions
Do "perf" and "petra" mean the same thing in a sentence?
Which is more common, "perf" or "petra"?
What to do next
Pair "perf" vs "petra" is on the table, pick a follow-up below.
- Full dictionary entry for "perf" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "petra" - compare definitions side by side with the headword page. Word entry
- This pair ranks #83,880 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "perf" and "petra" 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 #83,880 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.