íon vs iu, What's the Difference?

Which to use

“íon” is a noun and “iu” is an abbrev - they look or sound alike but fill different roles in a sentence.

#44,174
“íon” frequency rank: #42,065
“iu” frequency rank: 86239
confusion score

Side-by-Side Comparison

Feature	íon	iu
Definition	espécie química eletricamente carregada, geralmente um átomo ou molécula que perdeu ou ganhou elétrons	código de língua ISO 639-3 para a macrolíngua esquimó/inuktitut

Letter map: íon vs iu

Shared letters muted; letters that set íon and iu apart highlighted. No shared letter run.

3 ch

íon

2 ch

Role in the sentence - íon and iu

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: íon is anoun and iuanabbrev. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 86239, derived from the frequency rank of both members and their visual similarity.

íon is recorded at frequency rank #44,174, classified as anoun. iu is at rank #42,065, tagged as anabbrev, pronounced /ˈi.u/, /ˈi.ʊ/.

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 86239, this pair ranks #595 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of íon vs iu

Shared letters: none. Private to "íon": noí. Private to "iu": iu.

"íon" · 3 letters · shape VVC · "iu" · 2 letters · shape VV

Frequently Asked Questions

Can "íon" and "iu" be used interchangeably?

No - they are not even the same part of speech. "íon" is a noun and "iu" an abbrev, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "íon" or "iu"?

"iu" is the more common of the two: it sits at frequency rank #42,065 in our Portuguese list, against #44,174 for "íon". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Pair "íon" vs "iu" is on the table, pick a follow-up below.

Full dictionary entry for "íon" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "iu" - compare definitions side by side with the headword page. Word entry
This pair ranks #595 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"íon" and "iu" also get mixed up with nearby pairs, the highest-scored neighbour is "ino vs íon". Nearby pair

Confusion rank #595 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.