PD

noun

By · According to Wiktionary data (CC BY-SA) ·

"pd" is a 2-letter English headword indexed on PlainSpell.

The verdict

“PD” is a moderately-common English word, ranked #11,261 in English word frequency and used as a noun.

#11,261
frequency rank, English
2
letters
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of police department.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

PD vs PM
50% similar
PD vs PP
50% similar
PD vs PR
50% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for PD
PropertyValue
HeadwordPD
LanguageEnglish
Part of speechNoun
Letters2
Frequency rank#11,261
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “PD” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). PD lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for PD is 2 letters long, classified as a noun. Corpus data places it at rank #11,261 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 22 distinct senses for this headword, so context determines which meaning a reader should apply.

PD doesn't appear in our generated misspelling index, suggesting the orthography follows predictable English patterns. It also participates in 20 confusable-pair relationships, "PM", "PP", "PR", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

This entry carries no recorded etymology, so its spelling is best read as a straightforward mapping from sound to letter. The correct English form is PD, spelled P-D.

Definition

  1. 1
    Initialism of police department.
  2. 2
    Initialism of phase detector.
  3. 3
    Initialism of public domain.
  4. 4
    Initialism of peritoneal dialysis.
  5. 5
    Initialism of penile duplication.
  6. 6
    Abbreviation of period (full stop) punctuation mark, used in communication systems without punctuation (e.g., telegrams).
  7. 7
    Initialism of professional development.
  8. 8
    Initialism of public defender.
  9. 9
    Initialism of Parkinson’s disease.
  10. 10
    Initialism of panic disorder.
  11. 11
    Initialism of personality disorder.
  12. 12
    Initialism of pupillary distance.
  13. 13
    Initialism of process deviation.
  14. 14
    Initialism of power delivery.
  15. 15
    Initialism of partial discharge.
  16. 16
    Initialism of pole dance.
  17. 17
    Initialism of program director.
  18. 18
    Initialism of producer director.
  19. 19
    Initialism of performance director.
  20. 20
    Initialism of Progressive Democrat.
  21. 21
    Initialism of positive deviance.
  22. 22
    Initialism of prosecutorial discretion.

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 "PD"?
"PD" is spelled P-D.
What does "PD" mean?
As a noun, "PD" means: Initialism of police department.
What words are commonly confused with "PD"?
"PD" is commonly confused with "PM", "PP", "PR". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
What language does "PD" come from?
"PD" is a English word. PlainSpell's reference spans five languages -- English, Spanish, Portuguese, French, and German -- with definitions, pronunciations, and spelling data for each.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “PD”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is P-D - every other letter order is a misspelling in standard orthography.
  • Don't mix it up with “PM” - see the side-by-side comparison. PD 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.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list