isogram
"isogram" is a 7-letter English headword indexed on PlainSpell.
The verdict
“isogram” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 7
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A word in which no letter of the alphabet occurs more than once.
| Property | Value |
|---|---|
| Headword | isogram |
| Language | English |
| Part of speech | Noun |
| Letters | 7 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “isogram” sits in English frequency
Rare enough to double-check
isogram is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. 2 senses are on record.
No misspelling variants are generated for isogram in our index, a sign its spelling follows regular English conventions. It is not paired with a close-neighbour confusable in our dataset, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: From iso- + -gram. The "contour line" sense was proposed in 1889 by Francis Galton. The correct English form is isogram, spelled I-S-O-G-R-A-M.
Definition
- 1A word in which no letter of the alphabet occurs more than once.
- 2A line on a map or chart, such as a contour line, joining points that have the same value for some quantity.
Etymology
From iso- + -gram. The "contour line" sense was proposed in 1889 by Francis Galton.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “isogram”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is I-S-O-G-R-A-M - every other letter order is a misspelling in standard orthography.
- 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.