Ku vs kun, What's the Difference?

Which to use

“Ku” is a name and “kun” is a noun - they look or sound alike but fill different roles in a sentence.

#14,350
“Ku” frequency rank: #20,404
“kun” frequency rank: 34754
confusion score

Side-by-Side Comparison

Feature	Ku	kun
Definition	A surname from Korean.	In the Japanese language, the pronunciation, or reading, of a kanji character as a native Japanese word that means what the character represents, contrasted with on.

Letter map: Ku vs kun

Shared letters muted; letters that set Ku and kun apart highlighted. Shared run: 2.

2 ch

3 ch

kun

Part-of-speech tell for Ku / kun

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: Ku is aname and kunanoun. On the page they differ by 1 extra letter(s) - “Ku” sits inside “kun”. Our composite confusion score for this pair is 34754, derived from the frequency rank of both members and their visual similarity.

Ku is recorded at frequency rank #14,350, classified as aname. kun is at rank #20,404, tagged as anoun.

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 34754, this pair ranks #318,014 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of Ku vs kun

Shared letters: ku. Private to "Ku": -. Private to "kun": n.

"Ku" · 2 letters · shape CV · "kun" · 3 letters · shape CVC

Frequently Asked Questions

Is swapping "Ku" for "kun" ever safe?

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

In ordinary English text, does "Ku" or "kun" show up more?

"Ku" is the more common of the two: it sits at frequency rank #14,350 in our English list, against #20,404 for "kun". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

You've compared "Ku" and "kun". Here's where to go from here.

Full dictionary entry for "Ku" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "kun" - compare definitions side by side with the headword page. Word entry
This pair ranks #318,014 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"Ku" and "kun" also get mixed up with nearby pairs, the highest-scored neighbour is "Kop vs kun". Nearby pair

Confusion rank #318,014 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.