HMI
"hmi" is a 3-letter English headword indexed on PlainSpell.
The verdict
“HMI” is uncommon English (frequency #80,533 among 23,837 “H” headwords), classed as a noun. The kind of spelling people second-guess.
- #80,533
- frequency rank, English
- 23,837
- “H” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of human-machine interface.
Corpus desk
Index EN-hmi · HMI · English
HMI · rank #80,533 · 0 variants · 0 confusables
- FREQ-RARE #80,533
- LEN-MID 3 letters
- VOW-1 1 vowel
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 23,837
- PHOTO-FINISH histrionics
Nearest frequency peer: histrionics (-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 “HMI”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- hexane
hexane
19,472 corpus weight
- Hiroko
Hiroko
19,470 corpus weight
- histrionics
histrionics
19,469 corpus weight
- HMI
HMI
19,468 corpus weight
- homebody
homebody
19,466 corpus weight
- homeostatic
homeostatic
19,464 corpus weight
What this shows Bars show where “HMI” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | HMI |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #80,533 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “HMI” sits in English frequency
Rare enough to double-check
HMI is uncommon English at frequency #80,533 among 23,837 “H” headwords, classed as anoun. Rarity is why readers land here mid-draft. 2 senses are on record.
HMI doesn't appear in our generated misspelling index, since its letter sequence doesn't invite the usual edit-distance slips. It is not paired with a close-neighbour confusable in our dataset, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.
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 HMI, spelled H-M-I.
Definition
- 1Initialism of human-machine interface.
- 2Initialism of hydrargyrum medium-arc iodide, a kind of lamp.
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
How do you spell "HMI"?
What does "HMI" mean?
What language does "HMI" come from?
Is PlainSpell free to use?
Similar English words by spelling shape
Same letter count and similar misspelling depth for "HMI", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 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.