koi

/kɔɪ/

//kɔɪ// noun

By · According to Wiktionary data (CC BY-SA) ·

"koi" is a 3-letter English headword indexed on PlainSpell.

The verdict

“koi” sits in 20 confusable pairs (corpus #26,483) as a noun. The look-alike neighbours are the real trap.

#26,483
frequency rank, English
1,236
“K” headwords
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Ornamental domesticated varieties of the Amur carp (Cyprinus rubrofuscus), of Japan and eastern Asia with red-gold or white coloring.

Corpus desk

Index EN-koi · koi · English

koi · rank #26,483 · 0 variants · 20 confusables

  • FREQ-MID #26,483
  • LEN-MID 3 letters
  • VOW-2 2 vowels
  • CONFUS-HIGH 20 pairs
  • VAR-0 0 variants
  • BOOK-MID 1,236
  • PHOTO-FINISH KMS

Nearest frequency peer: KMS (-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 “koi”

Peers at similar corpus weight, separate from look-alike pairs below

corpus weight

What this shows Bars place “koi” against nearest ranked English headwords, not a reprint of the confusable-pair desk.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

koi vs ky
33% similar
koi vs Ku
0% similar
koi vs KS
0% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for koi
PropertyValue
Headwordkoi
LanguageEnglish
Part of speechNoun
IPA/kɔɪ/
Letters3
Frequency rank#26,483
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Corpus rank beside confusables of “koi”

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).koilands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “KMS” (#26,482), “Kwon” (#26,484), “Kissinger” (#26,481). Among 1,236 “K” headwords, “koi” is #26,483. Source: FrequencyWords open word-frequency list.

Easy to mix with look-alikes

The spelling risk for koi is neighbouring look-alikes ("ky", "Ku", …), not just typos; it is anoun pronounced /kɔɪ/. Frequency #26,483 among 1,236 “K” headwords. Gloss: "Ornamental domesticated varieties of the Amur carp (Cyprinus rubrofuscus), of Japan and eastern Asia with red-gold or white coloring.".

The misspelling generator found no plausible variants for koi, suggesting the orthography follows predictable English patterns. It also participates in 20 confusable-pair relationships, "ky", "Ku", "KS", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From Japanese 鯉 (koi). The correct English form is koi, spelled K-O-I.

Definition

  1. 1
    Ornamental domesticated varieties of the Amur carp (Cyprinus rubrofuscus), of Japan and eastern Asia with red-gold or white coloring.

Recorded use

Wiktionary example

These source excerpts show how koi appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. We sense that while it might be wonderful for Krystle and Alexis to have a catfight in a koi pond, it would be inappropriate for Joan to smack Linda with a koi.

Etymology

From Japanese 鯉 (koi).

Synonyms

koi carp

This word in other languages

koï(Français)Koi(Deutsch)

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

How do you spell "koi"?
"koi" is spelled K-O-I. The IPA pronunciation is /kɔɪ/.
What does "koi" mean?
As a noun, "koi" means: Ornamental domesticated varieties of the Amur carp (Cyprinus rubrofuscus), of Japan and eastern Asia with red-gold or white coloring.
What words are commonly confused with "koi"?
"koi" is commonly confused with "ky", "Ku", "KS". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "koi"?
The IPA (International Phonetic Alphabet) transcription for "koi" is /kɔɪ/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "koi"?
From Japanese 鯉 (koi). See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "koi", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 3 letters (nearest by frequency rank).

KMS#26,482keg#26,479Mau#26,500HHS#26,459

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list