H5N1
"h5n1" is a 2-letter English headword indexed on PlainSpell.
The verdict
“H5N1” is uncommon English (frequency #63,666 among 23,837 “H” headwords), classed as a noun. The kind of spelling people second-guess.
- #63,666
- frequency rank, English
- 23,837
- “H” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A strain of avian influenza, often lethal in humans but not transmissible between humans.
Corpus desk
Index EN-h5n1 · H5N1 · English
H5N1 · rank #63,666 · 0 variants · 0 confusables
- FREQ-RARE #63,666
- LEN-MID 4 letters
- VOW-0 0 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 23,837
- PHOTO-FINISH gunplay
Nearest frequency peer: gunplay (-2 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 “H5N1”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- gulps
gulps
36,339 corpus weight
- guna
guna
36,338 corpus weight
- gunplay
gunplay
36,337 corpus weight
- H5N1
H5N1
36,335 corpus weight
- Haman
Haman
36,333 corpus weight
- Harwell
Harwell
36,330 corpus weight
What this shows Bars show where “H5N1” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | H5N1 |
| Language | English |
| Part of speech | Noun |
| Letters | 4 |
| Frequency rank | #63,666 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “H5N1” sits in English frequency
Rare enough to double-check
H5N1 is uncommon English at frequency #63,666 among 23,837 “H” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "A strain of avian influenza, often lethal in humans but not transmissible between humans.".
No misspelling variants are generated for H5N1 in our index, suggesting the orthography follows predictable English patterns. This headword has no recorded confusable partner, since no other headword is close enough in sound or shape to pair with it.
No explicit etymology string is stored 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 H5N1, spelled H-5-N-1.
Definition
- 1A strain of avian influenza, often lethal in humans but not transmissible between humans.
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 May 6, 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 "H5N1", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 4 letters (nearest by frequency 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.