Koi vs ku, What's the Difference?

Which to use

“Koi” is a noun and “ku” is a pronoun - they look or sound alike but fill different roles in a sentence.

#46,782
“Koi” frequency rank: #17,061
“ku” frequency rank: 63843
confusion score

Side-by-Side Comparison

Feature	Koi	ku
Definition	japanische Zuchtform des Karpfens	wo

Letter map: Koi vs ku

Shared letters muted; letters that set Koi and ku apart highlighted. Shared run: 1.

3 ch

Koi

2 ch

Role in the sentence - Koi and ku

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: Koi is anoun and kuapronoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 63843, derived from the frequency rank of both members and their visual similarity.

Koi is recorded at frequency rank #46,782, classified as anoun, pronounced [kɔɪ̯]. ku is at rank #17,061, tagged as apron, pronounced […].

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 63843, this pair ranks #662,367 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of Koi vs ku

Shared letters: k. Private to "Koi": io. Private to "ku": u.

"Koi" · 3 letters · shape CVV · "ku" · 2 letters · shape CV

Frequently Asked Questions

Can "Koi" and "ku" be used interchangeably?

No - they are not even the same part of speech. "Koi" is a noun and "ku" a pronoun, so a sentence built for one is usually ungrammatical with the other.

In ordinary German text, does "Koi" or "ku" show up more?

"ku" is the more common of the two: it sits at frequency rank #17,061 in our German list, against #46,782 for "Koi". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Done with this confusable. These links stay specific to "Koi" and "ku".

Full dictionary entry for "Koi" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ku" - compare definitions side by side with the headword page. Word entry
This pair ranks #662,367 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
"Koi" and "ku" also get mixed up with nearby pairs, the highest-scored neighbour is "Koi vs kola". Nearby pair

Confusion rank #662,367 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.