Which to use
“pillo” is an adjective and “piojo” is a noun - they look or sound alike but fill different roles in a sentence.
- #18,643
- “pillo” frequency rank
- #32,804
- “piojo” frequency rank
- 51447
- confusion score
Side-by-Side Comparison
| Feature | pillo | piojo |
|---|---|---|
| Definition | Se dice del pícaro que no tiene crianza ni buenos modales. | (orden Phthiraptera) Cualquiera de más de 3000 especies de insectos ápteros adaptados para parasitar virtualmente todas las especies de mamíferos y aves, cuya sangre consumen, alojándose en el cabello del cuerpo y la cabeza. Su cuerpo está diseñado para este hábitat, con el primer par de patas modificado para permitir la sujeción al cabello. Son extremadamente fértiles, depositando las hembras hasta unos 200 huevos en los 30 días de su vida adulta. Tienen el cuerpo aplanado y de color oscuro o pardoamarillento. La infestación con piojos se denomina pediculosis, y provoca comezón, además de funcionar como vector para otras enfermedades —en particular el tifus— y provocar anemia en casos agudos. |
Where the eye mixes pillo and piojo
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. pillo (CVCCV) and piojo (CVVCV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Why the eye confuses pillo with piojo
These two trip readers on the page rather than in the ear: pillo is [ˈpiʝo] while piojo is [ˈpjoxo]. 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 noun), which is usually the fastest check. Our composite confusion score for this pair is 51447, derived from the frequency rank of both members and their visual similarity.
pillo is recorded at frequency rank #18,643, classified as anadj, pronounced [ˈpiʝo]. piojo is at rank #32,804, tagged as anoun, pronounced [ˈpjoxo].
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 51447, this pair ranks #97,832 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of pillo vs piojo
Shared letters: iop. Private to "pillo": l. Private to "piojo": j.
"pillo" · 5 letters · shape CVCCV · "piojo" · 5 letters · shape CVVCV
Known mistypes of this pair
Frequently Asked Questions
Do "pillo" and "piojo" mean the same thing in a sentence?
Which is more common, "pillo" or "piojo"?
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 "pillo" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "piojo" - compare definitions side by side with the headword page. Word entry
- This pair ranks #97,832 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "pillo" and "piojo" also get mixed up with nearby pairs, the highest-scored neighbour is "piojo vs probo". 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 #97,832 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.