perf vs PR, What's the Difference?

Which to use

“perf” is an adjective and “PR” is a noun - they look or sound alike but fill different roles in a sentence.

#42,815
“perf” frequency rank: #5,248
“PR” frequency rank: 48063
confusion score

Side-by-Side Comparison

Feature	perf	PR
Definition	Abbreviation of perforated; when followed by a number, eg, perf 14, this indicates the number of perforations per two centimetres.	Initialism of public relations.

Letter map: perf vs PR

Shared letters muted; letters that set perf and PR apart highlighted. Shared run: 2.

4 ch

perf

2 ch

Role in the sentence - perf and PR

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: perf is anadjective and PRanoun. On the page they differ by 2 letter(s) in length. Our composite confusion score for this pair is 48063, 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/. PR is at rank #5,248, 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 48063, this pair ranks #196,639 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of perf vs PR

Shared letters: pr. Private to "perf": ef. Private to "PR": -.

"perf" · 4 letters · shape CVCC · "PR" · 2 letters · shape CC

Known mistypes of this pair

perf ← eprf · pefr · perff · perrf · pperf · pref

Frequently Asked Questions

Is swapping "perf" for "PR" ever safe?

No - they are not even the same part of speech. "perf" is an adjective and "PR" a noun, so a sentence built for one is usually ungrammatical with the other.

In ordinary English text, does "perf" or "PR" show up more?

"PR" is the more common of the two: it sits at frequency rank #5,248 in our English list, against #42,815 for "perf". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

You've compared "perf" and "PR". Here's where to go from here.

Full dictionary entry for "perf" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "PR" - compare definitions side by side with the headword page. Word entry
This pair ranks #196,639 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"perf" and "PR" 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 #196,639 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.