PFD
"pfd" is a 3-letter English headword indexed on PlainSpell.
The verdict
“PFD” is uncommon English (frequency #79,852 among 4,417 “P” headwords), classed as a noun. The kind of spelling people second-guess.
- #79,852
- frequency rank, English
- 4,417
- “P” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of phase-frequency detector.
Corpus desk
Index EN-pfd · PFD · English
PFD · rank #79,852 · 0 variants · 0 confusables
- FREQ-RARE #79,852
- LEN-MID 3 letters
- VOW-0 0 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 4,417
- PHOTO-FINISH Pewds
Nearest frequency peer: Pewds (-1 rank slots)
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Long-tail ranks near “PFD”
Sparse band: bars invert rank so rarer forms read shorter
- Pesach
Pesach
20,152 corpus weight
- Pewds
Pewds
20,150 corpus weight
- PFD
PFD
20,149 corpus weight
- phytophthora
phytophthora
20,147 corpus weight
- pili
pili
20,146 corpus weight
- Pilsen
Pilsen
20,145 corpus weight
What this shows Long-tail view: where “PFD” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | PFD |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #79,852 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “PFD” in English
Rare enough to double-check
PFD is uncommon English at frequency #79,852 among 4,417 “P” headwords, classed as anoun. Rarity is why readers land here mid-draft. 5 senses are on record.
PFD has no tracked misspelling variants, typically a sign the spelling maps closely to how the word sounds. Our confusable-pair dataset has no match for it, a sign it's visually distinctive enough not to be mixed up with another word.
No explicit etymology string is stored for this entry, so its spelling is best explained by sound-to-letter mapping rather than etymology. The correct English form is PFD, spelled P-F-D.
Definition
- 1Initialism of phase-frequency detector.
- 2Initialism of personal flotation device.
- 3Initialism of primary flight display.
- 4Initialism of process flow diagram.
- 5Initialism of photon flux density.
Recorded use
Wiktionary examplesThese source excerpts show how PFD appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Return your PFD to a hanger on the PFD storage rack.
Above 32 degrees latitude in the Atlantic Ocean, commercial fishing vessels must carry immersion suits. Below that latitude, they must carry lifejackets, also known as personal flotation devices (PFDs). In other waters, the dividing line is 35 degrees. The PFDs have to be on the boat. Fishers do not have to wear them.
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
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "PFD", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).