Isan
"isan" is a 4-letter English headword indexed on PlainSpell.
The verdict
“Isan” is uncommon English (frequency #90,590 among 17,902 “I” headwords), classed as a proper noun. The kind of spelling people second-guess.
- #90,590
- frequency rank, English
- 17,902
- “I” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A large region in northeastern Thailand, on the Khorat Plateau.
| Property | Value |
|---|---|
| Headword | Isan |
| Language | English |
| Part of speech | Proper noun |
| Letters | 4 |
| Frequency rank | #90,590 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “Isan” sits in English frequency
Rare enough to double-check
Isan is uncommon English at frequency #90,590 among 17,902 “I” headwords, classed as aproper noun. Rarity is why readers land here mid-draft. 2 senses are on record.
Isan doesn't appear in our generated misspelling index, and the word's spelling is regular enough that our generator found nothing worth flagging. This headword has no recorded confusable partner, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: From Thai อีสาน (ii-sǎan) (same in Isan), claimed to be from Sanskrit ईशान (īśāna, “Shiva of the northeast”). The correct English form is Isan, spelled I-S-A-N.
Definition
- 1A large region in northeastern Thailand, on the Khorat Plateau.
- 2The language of the Isan people (between Lao and Thai, and sometimes considered a dialect of Lao, although it is written in Thai script).
Etymology
From Thai อีสาน (ii-sǎan) (same in Isan), claimed to be from Sanskrit ईशान (īśāna, “Shiva of the northeast”).
Synonyms
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 “Isan”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is I-S-A-N - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this 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.