Which to use
“casto” is an adjective and “causo” is a verb - they look or sound alike but fill different roles in a sentence.
- #44,616
- “casto” frequency rank
- #31,256
- “causo” frequency rank
- 75872
- confusion score
Side-by-Side Comparison
| Feature | casto | causo |
|---|---|---|
| Definition | Persona que se abstiene de todo goce sexual o lo vive de acuerdo a ciertas directrices dictadas por su religión o su moral. | Primera persona del singular (yo) del presente de indicativo de causar. |
Where the eye mixes casto and causo
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. casto (CVCCV) and causo (CVVCV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Why the eye confuses casto with causo
These two trip readers on the page rather than in the ear: casto is [ˈkast̪o] while causo is [ˈkawso]. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs verb), which is usually the fastest check. Our composite confusion score for this pair is 75872, derived from the frequency rank of both members and their visual similarity.
casto is recorded at frequency rank #44,616, classified as anadj, pronounced [ˈkast̪o]. causo is at rank #31,256, tagged as averb, pronounced [ˈkawso].
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 75872, this pair ranks #18,744 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.
Orthographic DNA of casto vs causo
Shared letters: acos. Private to "casto": t. Private to "causo": u.
"casto" · 5 letters · shape CVCCV · "causo" · 5 letters · shape CVVCV
Known mistypes of this pair
Frequently Asked Questions
Can "casto" and "causo" be used interchangeably?
In ordinary Spanish text, does "casto" or "causo" show up more?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "casto" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "causo" - compare definitions side by side with the headword page. Word entry
- This pair ranks #18,744 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "casto" and "causo" 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 #18,744 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.