key vs KS, What's the Difference?

Which to use

“key” and “KS” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#788
“key” frequency rank: #14,578
“KS” frequency rank: 15366
confusion score

Side-by-Side Comparison

Feature	key	KS
Definition	An object designed to open and close a lock.	Initialism of Kaposi's sarcoma.

Letter map: key vs KS

Shared letters muted; letters that set key and KS apart highlighted. Shared run: 1.

3 ch

key

2 ch

Corpus notes: key and KS

key and KS are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 15366, derived from the frequency rank of both members and their visual similarity.

key is recorded at frequency rank #788, classified as anoun, pronounced /kiː/. KS is at rank #14,578, 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 15366, this pair ranks #464,362 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of key vs KS

Shared letters: k. Private to "key": ey. Private to "KS": s.

"key" · 3 letters · shape CVV · "KS" · 2 letters · shape CC

Frequently Asked Questions

Can "key" and "KS" be used interchangeably?

No. They differ by 1 letter(s) in length, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.

Frequency check: "key" vs "KS" - which ranks higher?

"key" is the more common of the two: it sits at frequency rank #788 in our English list, against #14,578 for "KS". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

Done with this confusable. These links stay specific to "key" and "KS".

Full dictionary entry for "key" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "KS" - compare definitions side by side with the headword page. Word entry
This pair ranks #464,362 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"key" and "KS" also get mixed up with nearby pairs, the highest-scored neighbour is "Kop vs KS". Nearby pair

Confusion rank #464,362 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.