ia vs io, What's the Difference?

Which to use

“ia” is a verb and “io” is an adverb - they look or sound alike but fill different roles in a sentence.

#600
“ia” frequency rank: #18,900
“io” frequency rank: 19500
confusion score

Side-by-Side Comparison

Feature	ia	io
Definition	primeira pessoa do singular do pretérito imperfeito do indicativo do verbo ir	sempre

Where the eye mixes ia and io

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

2 ch

Look-alike desk: ia vs io

These two trip readers on the page rather than in the ear: ia is /ˈi.ɐ/ while io is /ˈi.o/, /ˈi.ɔ/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - a in “ia” becomes o in “io”, and the parts of speech differ too (verb vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 19500, derived from the frequency rank of both members and their visual similarity.

ia is recorded at frequency rank #600, classified as averb, pronounced /ˈi.ɐ/. io is at rank #18,900, tagged as anadv, pronounced /ˈi.o/, /ˈi.ɔ/.

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 19500, this pair ranks #51,199 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ia vs io

Shared letters: i. Private to "ia": a. Private to "io": o.

"ia" · 2 letters · shape VV · "io" · 2 letters · shape VV

Frequently Asked Questions

Can "ia" and "io" be used interchangeably?

No - they are not even the same part of speech. "ia" is a verb and "io" an adverb, so a sentence built for one is usually ungrammatical with the other.

Frequency check: "ia" vs "io" - which ranks higher?

"ia" is the more common of the two: it sits at frequency rank #600 in our Portuguese list, against #18,900 for "io". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Eye-level mix-up between "ia" and "io" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "ia" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "io" - compare definitions side by side with the headword page. Word entry
This pair ranks #51,199 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"ia" and "io" also get mixed up with nearby pairs, the highest-scored neighbour is "ino vs io". Nearby pair

Confusion rank #51,199 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.