Which to use
“árduo” is an adjective and “aro” is a noun - they look or sound alike but fill different roles in a sentence.
- #22,504
- “árduo” frequency rank
- #22,868
- “aro” frequency rank
- 45372
- confusion score
Side-by-Side Comparison
| Feature | árduo | aro |
|---|---|---|
| Definition | de difícil acesso | caixilho de madeira para os vãos das portas e janelas |
Where the eye mixes árduo and aro
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between árduo and aro
These two trip readers on the page rather than in the ear: árduo is /ˈaɾ.dwu/ while aro is /ˈa.ɾu/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 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 45372, derived from the frequency rank of both members and their visual similarity.
árduo is recorded at frequency rank #22,504, classified as anadj, pronounced /ˈaɾ.dwu/. aro is at rank #22,868, tagged as anoun, pronounced /ˈa.ɾu/.
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 45372, this pair ranks #20,030 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of árduo vs aro
Shared letters: or. Private to "árduo": duá. Private to "aro": a.
"árduo" · 5 letters · shape VCCVV · "aro" · 3 letters · shape VCV
Frequently Asked Questions
Do "árduo" and "aro" mean the same thing in a sentence?
Which is more common, "árduo" or "aro"?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "árduo" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "aro" - compare definitions side by side with the headword page. Word entry
- This pair ranks #20,030 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "árduo" and "aro" also get mixed up with nearby pairs, the highest-scored neighbour is "acs vs aro". Nearby pair
Confusion rank #20,030 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.