PAH
"pah" is a 3-letter English headword indexed on PlainSpell.
The verdict
“PAH” sits in 20 confusable pairs (corpus #38,539) as a noun. The look-alike neighbours are the real trap.
- #38,539
- frequency rank, English
- 4,417
- “P” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of phenylalanine hydroxylase.
Corpus desk
Index EN-pah · PAH · English
PAH · rank #38,539 · 0 variants · 20 confusables
- FREQ-MID #38,539
- LEN-MID 3 letters
- VOW-1 1 vowel
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 4,417
- PHOTO-FINISH PAG
Nearest frequency peer: PAG (-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.
Frequency neighbourhood for “PAH”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- overreaction
overreaction
61,465 corpus weight
- overused
overused
61,464 corpus weight
- PAG
PAG
61,463 corpus weight
- PAH
PAH
61,462 corpus weight
- painkiller
painkiller
61,461 corpus weight
- panchayat
panchayat
61,460 corpus weight
What this shows Bars show where “PAH” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
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 | PAH |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #38,539 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “PAH” sits in English frequency
Easy to mix with look-alikes
The spelling risk for PAH is neighbouring look-alikes ("PM", "PC", …), not just typos; it is anoun. Frequency #38,539 among 4,417 “P” headwords. 4 recorded senses keep meaning in play.
Zero misspellings are on record for PAH in our index, suggesting the orthography follows predictable English patterns. It also participates in 20 confusable-pair relationships, "PM", "PC", "PP", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
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 PAH, spelled P-A-H.
Definition
- 1Initialism of phenylalanine hydroxylase.
- 2Initialism of polycyclic aromatic hydrocarbon.
- 3Initialism of pulmonary arterial hypertension.
- 4Initialism of paradoxical adipose hyperplasia.
Recorded use
Wiktionary exampleThese source excerpts show how PAH appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Researchers analysed samples of nurdles and burnt lumps of plastic from four Sri Lankan beaches for heavy metals and various chemicals, including benzotriazole UV-stabilisers, which are used to prevent discoloration in plastics, bisphenols and polyaromatic hydrocarbons (PAHs). […] Of particular concern, they said, were levels of PAHs found on the burnt lu…
This word in other languages
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.
PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of September 3, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.
Frequently Asked Questions
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "PAH", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).
What to do next
You've looked up "PAH". Here's where to go from here.
- "PAH" maps to 20 confusable pairs in this vintage; the highest-scored is "PM". View pair
- Usage frequency rank #38,539 among English headwords in this corpus. Corpus statistics
- Browse more English words in the "P" letter cohort. P–Z browse
- PlainSpell rotates a curated Word of the Day from the English corpus, a passive way to discover vocabulary. Word of the Day
PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.
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.