Which to use
“cipher” and “cypher” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #24,701
- “cipher” frequency rank
- #36,948
- “cypher” frequency rank
- 61649
- confusion score
Side-by-Side Comparison
| Feature | cipher | cypher |
|---|---|---|
| Definition | A numeric character. | Alternative spelling of cipher. |
Letter map: cipher vs cypher
Shared letters muted; letters that set cipher and cypher apart highlighted. Shared run: 5.
Spelling & dictionary notes on cipher vs cypher
cipher and cypher 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 a single letter - i in “cipher” becomes y in “cypher”. Our composite confusion score for this pair is 61649, derived from the frequency rank of both members and their visual similarity.
cipher is recorded at frequency rank #24,701, classified as anoun, pronounced /ˈsaɪfə/. cypher is at rank #36,948, 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 61649, this pair ranks #93,013 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of cipher vs cypher
Shared letters: cehpr. Private to "cipher": i. Private to "cypher": y.
"cipher" · 6 letters · shape CVCCVC · "cypher" · 6 letters · shape CVCCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "cipher" for "cypher" ever safe?
Which is more common, "cipher" or "cypher"?
What to do next
Done with this confusable. These links stay specific to "cipher" and "cypher".
- Full dictionary entry for "cipher" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "cypher" - compare definitions side by side with the headword page. Word entry
- This pair ranks #93,013 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "cipher" and "cypher" also get mixed up with nearby pairs, the highest-scored neighbour is "copier vs cypher". 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 #93,013 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.