PF
"pf" is a 2-letter English headword indexed on PlainSpell.
The verdict
“PF” is a moderately-common English word, ranked #16,301 in English word frequency and used as a noun.
- #16,301
- frequency rank, English
- 2
- letters
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of pilot flying, a pilot currently in control of the flight trajectory of the aircraft, as opposed to pilot monitoring.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | PF |
| Language | English |
| Part of speech | Noun |
| Letters | 2 |
| Frequency rank | #16,301 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “PF” sits in English frequency
Spelling & Dictionary Insight
The English entry for PF is 2 letters long, classified as a noun. Corpus data places it at rank #16,301 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 9 distinct senses for this headword, so context determines which meaning a reader should apply.
PF has no tracked misspelling variants, typically a sign the spelling maps closely to how the word sounds. It also participates in 20 confusable-pair relationships, "PM", "PP", "PR", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
This entry's etymology isn't recorded, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is PF, spelled P-F.
Definition
- 1Initialism of pilot flying, a pilot currently in control of the flight trajectory of the aircraft, as opposed to pilot monitoring.
- 2Initialism of peak flow.
- 3Abbreviation of power failure; displayed by some household appliances after a power outage.
- 4Initialism of phonological form.
- 5Initialism of psychometric function.
- 6Initialism of personal foul.
- 7Initialism of power forward.
- 8Initialism of points for.
- 9Initialism of patrol fighter.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
How do you spell "PF"?
What does "PF" mean?
What words are commonly confused with "PF"?
What language does "PF" come from?
Is PlainSpell free to use?
Using “PF”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is P-F - every other letter order is a misspelling in standard orthography.
- Don't mix it up with “PM” - see the side-by-side comparison. PF vs PM
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.