Which to use
“ko” and “koji” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #10,717
- “ko” frequency rank
- #46,016
- “koji” frequency rank
- 56733
- confusion score
Side-by-Side Comparison
| Feature | ko | koji |
|---|---|---|
| Definition | A local shape to which the ko rule applies; a ko shape. | A substance that is produced by letting a mold, especially Aspergillus oryzae, grow on rice, barley, soybeans, etc., used to make fermented products such as sake, amazake, miso, and soy sauce. |
Where the eye mixes ko and koji
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: ko vs koji
A purely visual mix-up. ko (/ˈkəʊ/) and koji (/ˈkoʊd͡ʒi/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 2 extra letter(s) - “ko” sits inside “koji”. Our composite confusion score for this pair is 56733, derived from the frequency rank of both members and their visual similarity.
ko is recorded at frequency rank #10,717, classified as anoun, pronounced /ˈkəʊ/. koji is at rank #46,016, tagged as anoun, pronounced /ˈkoʊd͡ʒi/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 56733, this pair ranks #124,113 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of ko vs koji
Shared letters: ko. Private to "ko": -. Private to "koji": ij.
"ko" · 2 letters · shape CV · "koji" · 4 letters · shape CVCV
Known mistypes of this pair
- koji ← kjoi · kkoji · koij · kojji · okji
Frequently Asked Questions
Can "ko" and "koji" be used interchangeably?
In ordinary English text, does "ko" or "koji" show up more?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "ko" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "koji" - compare definitions side by side with the headword page. Word entry
- This pair ranks #124,113 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "ko" and "koji" also get mixed up with nearby pairs, the highest-scored neighbour is "koji vs Kop". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #124,113 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.