ko vs Ku, What's the Difference?

Which to use

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

#10,717
“ko” frequency rank: #14,350
“Ku” frequency rank: 25067
confusion score

Side-by-Side Comparison

Feature	ko	Ku
Definition	A local shape to which the ko rule applies; a ko shape.	A surname from Korean.

Letter map: ko vs Ku

Shared letters muted; letters that set ko and Ku apart highlighted. Shared run: 1.

2 ch

Role in the sentence - ko and Ku

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: ko is anoun and Kuaname. On the page they differ by a single letter - o in “ko” becomes u in “Ku”. Our composite confusion score for this pair is 25067, 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/. Ku is at rank #14,350, tagged as aname.

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 25067, this pair ranks #397,185 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ko vs Ku

Shared letters: k. Private to "ko": o. Private to "Ku": u.

"ko" · 2 letters · shape CV · "Ku" · 2 letters · shape CV

Frequently Asked Questions

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

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

Which is more common, "ko" or "Ku"?

"ko" is the more common of the two: it sits at frequency rank #10,717 in our English list, against #14,350 for "Ku". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Pair "ko" vs "Ku" is on the table, pick a follow-up below.

Full dictionary entry for "ko" 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 #397,185 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"ko" and "Ku" also get mixed up with nearby pairs, the highest-scored neighbour is "Kop vs Ku". Nearby pair

Confusion rank #397,185 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.