perf vs petri, What's the Difference?

Which to use

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

#42,815
“perf” frequency rank: #29,786
“petri” frequency rank: 72601
confusion score

Side-by-Side Comparison

Feature	perf	petri
Definition	Abbreviation of perforated; when followed by a number, eg, perf 14, this indicates the number of perforations per two centimetres.	Ellipsis of petri dish.

Where the spellings diverge

Shared letters are muted; the letters that actually set perf and petri apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.

4 ch

perf

5 ch

petri

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: perf is /pɜː(ɹ)f/ while petri is /ˈpiːtɹi/. 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 (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 72601, 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/. petri is at rank #29,786, tagged as anoun, pronounced /ˈpiːtɹi/.

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 72601, this pair ranks #42,497 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of perf vs petri

Shared letters: epr. Private to "perf": f. Private to "petri": it.

"perf" · 4 letters · shape CVCC · "petri" · 5 letters · shape CVCCV

Known mistypes of this pair

perf ← eprf · pefr · perff · perrf · pperf · pref
petri ← eptri · perti · petir · petrri · pettri · ppetri · pteri

Frequency comparison

perf#42,815

petri#29,786

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "perf" and "petri" be used interchangeably?

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

Which is more common, "perf" or "petri"?

"petri" is the more common of the two: it sits at frequency rank #29,786 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.

Remembering perf vs petri

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 “petri”.
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