exon
"exon" is a 4-letter English headword indexed on PlainSpell.
The verdict
“exon” is a moderately-common English word, ranked #49,909 in English word frequency and used as a noun.
- #49,909
- frequency rank, English
- 4
- letters
- 4
- tracked misspellings
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - An officer of the King's Body Guard of the Yeomen of the Guard.
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 | exon |
| Language | English |
| Part of speech | Noun |
| Letters | 4 |
| Frequency rank | #49,909 |
| Misspellings tracked | 4 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “exon” sits in English frequency
Spelling & Dictionary Insight
The English entry for exon is 4 letters long, classified as a noun. Corpus data places it at rank #49,909 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. The dominant gloss from Wiktionary reads: "An officer of the King's Body Guard of the Yeomen of the Guard.".
Our generated misspelling index lists 4 likely wrong-spelling variants for exon, with forms such as "eoxn", "exno", and "exonn". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 20 confusable-pair relationships, "expo", "Exxon", "ex", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
Etymologically, the entry records: Apparently an attempt to express the pronunciation of French exempt. The correct English form is exon, spelled E-X-O-N.
Definition
- 1An officer of the King's Body Guard of the Yeomen of the Guard.
Etymology
Apparently an attempt to express the pronunciation of French exempt.
Common misspellings
Also misspelled as: eoxn,exno,exonn,xeon
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of exon - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.
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 “exon”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is E-X-O-N - every other letter order is a misspelling in standard orthography.
- Don't mix it up with “expo” - see the side-by-side comparison. exon vs expo
- Browse more English words and confusable pairs in the same reference. English words
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.