Which to use
“key” and “knee” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #788
- “key” frequency rank
- #4,098
- “knee” frequency rank
- 4886
- confusion score
Side-by-Side Comparison
| Feature | key | knee |
|---|---|---|
| Definition | An object designed to open and close a lock. | In humans, the joint or the region of the joint in the middle part of the leg between the thigh and the shank. |
Where the eye mixes key and knee
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses key with knee
A purely visual mix-up. key (/kiː/) and knee (/niː/) 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 1 letter(s) in length. Our composite confusion score for this pair is 4886, derived from the frequency rank of both members and their visual similarity.
key is recorded at frequency rank #788, classified as anoun, pronounced /kiː/. knee is at rank #4,098, tagged as anoun, pronounced /niː/.
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 4886, this pair ranks #517,333 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of key vs knee
Shared letters: ek. Private to "key": y. Private to "knee": n.
"key" · 3 letters · shape CVV · "knee" · 4 letters · shape CCVV
Known mistypes of this pair
- knee ← kene · kknee · kne · knnee · nkee
Frequently Asked Questions
Do "key" and "knee" mean the same thing in a sentence?
Frequency check: "key" vs "knee" - which ranks higher?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "key" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "knee" - compare definitions side by side with the headword page. Word entry
- This pair ranks #517,333 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "key" and "knee" also get mixed up with nearby pairs, the highest-scored neighbour is "knee vs kno". 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 #517,333 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.