HEPA
/ˈhɛpə/
"hepa" is a 4-letter English headword indexed on PlainSpell.
The verdict
“HEPA” is uncommon English (frequency #77,763 among 23,837 “H” headwords), classed as a noun. The kind of spelling people second-guess.
- #77,763
- frequency rank, English
- 23,837
- “H” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Acronym of high-efficiency particulate air filter.
| Property | Value |
|---|---|
| Headword | HEPA |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈhɛpə/ |
| Letters | 4 |
| Frequency rank | #77,763 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “HEPA” sits in English frequency
Rare enough to double-check
HEPA is uncommon English at frequency #77,763 among 23,837 “H” headwords, classed as anoun, transcribed /ˈhɛpə/. Rarity is why readers land here mid-draft. Gloss: "Acronym of high-efficiency particulate air filter.".
Zero misspellings are on record for HEPA in our index, typically a sign the spelling maps closely to how the word sounds. Our dataset records no confusable match here, since its spelling is unusual enough that it doesn't cluster with a lookalike.
Our source data has no etymology on file for this entry, leaving phoneme-to-grapheme mapping as the best guide to its spelling rather than a borrowing history. The correct English form is HEPA, spelled H-E-P-A.
Definition
- 1Acronym of high-efficiency particulate air filter.
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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Using “HEPA”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is H-E-P-A - every other letter order is a misspelling in standard orthography.
- Say it as /ˈhɛpə/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
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.