Which to use
“rex” and “río” are a confusable Spanish pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #13,343
- “rex” frequency rank
- #698
- “río” frequency rank
- 14041
- confusion score
Side-by-Side Comparison
| Feature | rex | río |
|---|---|---|
| Definition | Rey, monarca. | Corriente de agua de caudal importante que discurre por tierra desde un manantial, una masa de hielos o un lago. |
Where the eye mixes rex and río
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Why the eye confuses rex with río
A purely visual mix-up. rex (/ˈreːks/) and río ([ˈrio]) 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 14041, derived from the frequency rank of both members and their visual similarity.
rex is recorded at frequency rank #13,343, classified as anoun, pronounced /ˈreːks/. río is at rank #698, tagged as anoun, pronounced [ˈrio].
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 14041, this pair ranks #285,622 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of rex vs río
Shared letters: r. Private to "rex": ex. Private to "río": oí.
"rex" · 3 letters · shape CVC · "río" · 3 letters · shape CVV
Frequently Asked Questions
Can "rex" and "río" be used interchangeably?
Frequency check: "rex" vs "río" - which ranks higher?
What to do next
Eye-level mix-up between "rex" and "río" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "rex" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "río" - compare definitions side by side with the headword page. Word entry
- This pair ranks #285,622 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "rex" and "río" also get mixed up with nearby pairs, the highest-scored neighbour is "rema vs rex". Nearby pair
Confusion rank #285,622 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.