Which to use
“casa” is a noun and “casto” is an adjective - they look or sound alike but fill different roles in a sentence.
- #136
- “casa” frequency rank
- #44,616
- “casto” frequency rank
- 44752
- confusion score
Side-by-Side Comparison
| Feature | casa | casto |
|---|---|---|
| Definition | Edificación destinada a vivienda. | Persona que se abstiene de todo goce sexual o lo vive de acuerdo a ciertas directrices dictadas por su religión o su moral. |
Where the eye mixes casa and casto
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. casa runs 4 letters (CVCV) against casto's 5 (CVCCV) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses casa with casto
These two trip readers on the page rather than in the ear: casa is [ˈkasa] while casto is [ˈkast̪o]. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 44752, derived from the frequency rank of both members and their visual similarity.
casa is recorded at frequency rank #136, classified as anoun, pronounced [ˈkasa]. casto is at rank #44,616, tagged as anadj, pronounced [ˈkast̪o].
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 44752, this pair ranks #135,319 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of casa vs casto
Shared letters: acs. Private to "casa": -. Private to "casto": ot.
"casa" · 4 letters · shape CVCV · "casto" · 5 letters · shape CVCCV
Known mistypes of this pair
Frequently Asked Questions
Can "casa" and "casto" be used interchangeably?
In ordinary Spanish text, does "casa" or "casto" show up more?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "casa" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "casto" - compare definitions side by side with the headword page. Word entry
- This pair ranks #135,319 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "casa" and "casto" also get mixed up with nearby pairs, the highest-scored neighbour is "casto vs Chasco". 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 #135,319 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.