ISA
/ˈaɪsə/
"isa" is a 3-letter English headword indexed on PlainSpell.
The verdict
“ISA” sits in 20 confusable pairs (corpus #13,178) as a noun. The look-alike neighbours are the real trap.
- #13,178
- frequency rank, English
- 2,140
- “I” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of instruction set architecture.
Corpus desk
Index EN-isa · ISA · English
ISA · rank #13,178 · 0 variants · 20 confusables
- FREQ-MID #13,178
- LEN-MID 3 letters
- VOW-2 2 vowels
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 2,140
- PHOTO-FINISH inventor
Nearest frequency peer: inventor (-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 neighbours of confusable “ISA”
Peers at similar corpus weight, separate from look-alike pairs below
- inherently
inherently
86,826 corpus weight
- insults
insults
86,825 corpus weight
- inventor
inventor
86,824 corpus weight
- ISA
ISA
86,823 corpus weight
- jailed
jailed
86,822 corpus weight
- jasper
jasper
86,821 corpus weight
What this shows Bars place “ISA” against nearest ranked English headwords, not a reprint of the confusable-pair desk.
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 | ISA |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈaɪsə/ |
| Letters | 3 |
| Frequency rank | #13,178 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Corpus rank beside confusables of “ISA”
Easy to mix with look-alikes
The spelling risk for ISA is neighbouring look-alikes ("it", "IV", …), not just typos; it is anoun pronounced /ˈaɪsə/. Frequency #13,178 among 2,140 “I” headwords. 6 recorded senses keep meaning in play.
No generated misspelling entries exist for ISA in our index, since its letter sequence doesn't invite the usual edit-distance slips. It also participates in 20 confusable-pair relationships, "it", "IV", "iz", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
No documented word history exists for this headword, so its spelling is easiest to reason about phoneme by phoneme, absent a documented history. The correct English form is ISA, spelled I-S-A.
Definition
- 1Initialism of instruction set architecture.
- 2Initialism of individual savings account, a financial account for investment with special tax rules.
- 3Initialism of International Standard on Auditing, one of a set of professional standards for the performance of audits of financial information issued by the IAASB.
- 4Initialism of intelligent speed assistance / adaptation.
- 5Initialism of isosaccharinic acid.
- 6Initialism of ideological state apparatus.
Recorded use
Wiktionary examplesThese source excerpts show how ISA appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Everyone has their own way of explaining it. The ISA is the bridge, or the interface, between the hardware and the software. Or it’s the blueprint. Or it’s the computer’s DNA. These are helpful enough, as is the common comparison of an ISA to a language. “You and I are using English,” as [Calista Redmond] said to me at the conference. “That’s our ISA.” Bu…
They have come to think of the universities, the civil service, and the media – the old Althusserian ISAs – with its orthodoxy of egalitarianism, democracy and social constructionism, as the Cathedral; a quasi-religious structure that functions hegemonically to supress^([sic]) dissent.
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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Similar English words by spelling shape
Same letter count and similar misspelling depth for "ISA", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).