Which to use
“K9” and “key” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #36,625
- “K9” frequency rank
- #788
- “key” frequency rank
- 37413
- confusion score
Side-by-Side Comparison
| Feature | K9 | key |
|---|---|---|
| Definition | A trained police dog. | An object designed to open and close a lock. |
Where the spellings diverge
Shared letters are muted; the letters that actually set K9 and key apart are highlighted. They share 1 letter in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
A purely visual mix-up. K9 (/ˈkeɪnaɪn/) and key (/kiː/) 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 37413, derived from the frequency rank of both members and their visual similarity.
K9 is recorded at frequency rank #36,625, classified as anoun, pronounced /ˈkeɪnaɪn/. key is at rank #788, tagged as anoun, pronounced /kiː/.
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 37413, this pair ranks #294,789 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of K9 vs key
Shared letters: k. Private to "K9": -. Private to "key": ey.
"K9" · 1 letters · shape C · "key" · 3 letters · shape CVV
Frequency comparison
Frequently Asked Questions
Can "K9" and "key" be used interchangeably?
Which is more common, "K9" or "key"?
Remembering K9 vs key
The fastest way to pick the right one every time.
- Read both glosses above and match the meaning you intend, only context separates this pair.
- See each word in full, definition, IPA, etymology and its other confusables. Full “K9” entry
- Browse more pairs most likely to be confused. Most confusable