io vs Ius, What's the Difference?

Which to use

“io” is a pronoun and “Ius” is a name - they look or sound alike but fill different roles in a sentence.

#9,480
“io” frequency rank: #43,081
“Ius” frequency rank: 52561
confusion score

Side-by-Side Comparison

Feature	io	Ius
Definition	Algo.	Apellido.

Where the eye mixes io and Ius

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

2 ch

3 ch

Ius

Visual trap between io and Ius

These two trip readers on the page rather than in the ear: io is /ˈi.o/ while Ius is [ˈjus]. 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 (pronoun vs name), which is usually the fastest check. Our composite confusion score for this pair is 52561, derived from the frequency rank of both members and their visual similarity.

io is recorded at frequency rank #9,480, classified as apron, pronounced /ˈi.o/. Ius is at rank #43,081, tagged as aname, pronounced [ˈjus].

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 52561, this pair ranks #92,101 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of io vs Ius

Shared letters: i. Private to "io": o. Private to "Ius": su.

"io" · 2 letters · shape VV · "Ius" · 3 letters · shape VVC

Frequently Asked Questions

Is swapping "io" for "Ius" ever safe?

No - they are not even the same part of speech. "io" is a pronoun and "Ius" a name, so a sentence built for one is usually ungrammatical with the other.

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

"io" is the more common of the two: it sits at frequency rank #9,480 in our Spanish list, against #43,081 for "Ius". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

Full dictionary entry for "io" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "Ius" - compare definitions side by side with the headword page. Word entry
This pair ranks #92,101 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
"io" and "Ius" also get mixed up with nearby pairs, the highest-scored neighbour is "Ius vs iza". Nearby pair

Confusion rank #92,101 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.