CPAP

/ˈsiːpæp/

//ˈsiːpæp// noun

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

"cpap" is a 4-letter English headword indexed on PlainSpell.

The verdict

“CPAP” is uncommon English (frequency #55,353 among 5,599 “C” headwords), classed as a noun. The kind of spelling people second-guess.

#55,353
frequency rank, English
5,599
“C” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of continuous positive airway pressure, a form of artificial ventilation.

Corpus desk

Index EN-cpap · CPAP · English

CPAP · rank #55,353 · 0 variants · 0 confusables

  • FREQ-RARE #55,353
  • LEN-MID 4 letters
  • VOW-1 1 vowel
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-DENSE 5,599
  • PHOTO-FINISH cowbell

Nearest frequency peer: cowbell (-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 “CPAP”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “CPAP” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for CPAP
PropertyValue
HeadwordCPAP
LanguageEnglish
Part of speechNoun
IPA/ˈsiːpæp/
Letters4
Frequency rank#55,353
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “CPAP” in English

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).CPAPfalls in this rarity band:

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

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Rare peers in the same band: “cowbell” (#55,352), “crabby” (#55,354), “Cracow” (#55,355). Among 5,599 “C” headwords, “CPAP” is #55,353. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

CPAP is uncommon English at frequency #55,353 among 5,599 “C” headwords, classed as anoun, transcribed /ˈsiːpæp/. Rarity is why readers land here mid-draft. 2 senses are on record.

CPAP has no tracked misspelling variants, since its letter sequence doesn't invite the usual edit-distance slips. This headword has no recorded confusable partner, since its spelling is unusual enough that it doesn't cluster with a lookalike.

Wiktionary doesn't record an etymology for this headword, so spelling patterns must be inferred from the word's phoneme-to-grapheme mapping rather than from a documented borrowing chain. The correct English form is CPAP, spelled C-P-A-P.

Definition

  1. 1
    Initialism of continuous positive airway pressure, a form of artificial ventilation.
  2. 2
    The machine used for continuous positive airway pressure therapy.

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 "CPAP"?
"CPAP" is spelled C-P-A-P. The IPA pronunciation is /ˈsiːpæp/.
What does "CPAP" mean?
As a noun, "CPAP" means: Initialism of continuous positive airway pressure, a form of artificial ventilation.
How do you pronounce "CPAP"?
The IPA (International Phonetic Alphabet) transcription for "CPAP" is /ˈsiːpæp/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What language does "CPAP" come from?
"CPAP" is a English word. You can look up definitions, pronunciations, and spelling data for this and other words across English, Spanish, Portuguese, French, and German on PlainSpell.
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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "CPAP", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 4 letters (nearest by frequency rank).

chih#55,323bier#55,279fila#55,436flit#55,441

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

Source: FrequencyWords open word-frequency list