Which to use
“casto” is an adjective and “costos” is a noun - they look or sound alike but fill different roles in a sentence.
- #44,616
- “casto” frequency rank
- #3,038
- “costos” frequency rank
- 47654
- confusion score
Side-by-Side Comparison
| Feature | casto | costos |
|---|---|---|
| Definition | Persona que se abstiene de todo goce sexual o lo vive de acuerdo a ciertas directrices dictadas por su religión o su moral. | Forma del plural de costo. |
Where the eye mixes casto and costos
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. casto runs 5 letters (CVCCV) against costos's 6 (CVCCVC) - the length gap alone is often enough to separate them once you know to check it.
Visual trap between casto and costos
These two trip readers on the page rather than in the ear: casto is [ˈkast̪o] while costos is [ˈkost̪os]. 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 (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 47654, 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]. costos is at rank #3,038, tagged as anoun, pronounced [ˈkost̪os].
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 47654, this pair ranks #118,835 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of casto vs costos
Shared letters: cost. Private to "casto": a. Private to "costos": -.
"casto" · 5 letters · shape CVCCV · "costos" · 6 letters · shape CVCCVC
Known mistypes of this pair
Frequently Asked Questions
Can "casto" and "costos" be used interchangeably?
In ordinary Spanish text, does "casto" or "costos" show up more?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "casto" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "costos" - compare definitions side by side with the headword page. Word entry
- This pair ranks #118,835 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "casto" and "costos" 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 #118,835 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.