casovsceroWhich spelling fits?

Which to use

“caso” and “cero” are a confusable Spanish pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#157
“caso” frequency rank
#2,152
“cero” frequency rank
2309
confusion score

Side-by-Side Comparison

Feature caso cero
Definition Cada una de varias instancias consideradas como pertenecientes a un mismo tipo de situaciones o cosas (como los casos de una enfermedad, etc.). Nombre del número 0.

Where the eye mixes caso and cero

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

4 ch
caso
4 ch
cero

Look-alike desk: caso vs cero

A purely visual mix-up. caso ([ˈkaso]) and cero ([ˈseɾo]) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 2309, derived from the frequency rank of both members and their visual similarity.

caso is recorded at frequency rank #157, classified as anoun, pronounced [ˈkaso]. cero is at rank #2,152, tagged as anoun, pronounced [ˈseɾo].

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 2309, this pair ranks #320,582 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of caso vs cero

Shared letters: co. Private to "caso": as. Private to "cero": er.

"caso" · 4 letters · shape CVCV  ·  "cero" · 4 letters · shape CVCV

Known mistypes of this pair

  • casoacso · casso · ccaso · csao
  • ceroccero · ceor · ecro · sero

Frequently Asked Questions

Is swapping "caso" for "cero" ever safe?
No. They are said differently ([ˈkaso] versus [ˈseɾo]) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
Which is more common, "caso" or "cero"?
"caso" is the more common of the two: it sits at frequency rank #157 in our Spanish list, against #2,152 for "cero". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Eye-level mix-up between "caso" and "cero" is sorted above. Next: full entries or other pairs that share a letter shape.

  • Full dictionary entry for "caso" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "cero" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #320,582 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "caso" and "cero" also get mixed up with nearby pairs, the highest-scored neighbour is "ceba vs cero". 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 #320,582 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list