Which to use
“koi” is a noun and “Kos” is a name - they look or sound alike but fill different roles in a sentence.
- #26,483
- “koi” frequency rank
- #27,534
- “Kos” frequency rank
- 54017
- confusion score
Side-by-Side Comparison
| Feature | koi | Kos |
|---|---|---|
| Definition | Ornamental domesticated varieties of the Amur carp (Cyprinus rubrofuscus), of Japan and eastern Asia with red-gold or white coloring. | An island of the Dodecanese, Greece. |
Letter map: koi vs Kos
Shared letters muted; letters that set koi and Kos apart highlighted. Shared run: 2.
Part-of-speech tell for koi / Kos
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: koi is anoun and Kosaname. On the page they differ by a single letter - i in “koi” becomes s in “Kos”. Our composite confusion score for this pair is 54017, derived from the frequency rank of both members and their visual similarity.
koi is recorded at frequency rank #26,483, classified as anoun, pronounced /kɔɪ/. Kos is at rank #27,534, 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 54017, this pair ranks #144,397 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of koi vs Kos
Shared letters: ko. Private to "koi": i. Private to "Kos": s.
"koi" · 3 letters · shape CVV · "Kos" · 3 letters · shape CVC
Frequently Asked Questions
Is swapping "koi" for "Kos" ever safe?
In ordinary English text, does "koi" or "Kos" show up more?
Useful next steps
Done with this confusable. These links stay specific to "koi" and "Kos".
- Full dictionary entry for "koi" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "Kos" - compare definitions side by side with the headword page. Word entry
- This pair ranks #144,397 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "koi" and "Kos" also get mixed up with nearby pairs, the highest-scored neighbour is "Kop vs Kos". Nearby pair
Confusion rank #144,397 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.