Which to use
“io” is a noun and “Ions” is a name - they look or sound alike but fill different roles in a sentence.
- #16,946
- “io” frequency rank
- #14,573
- “Ions” frequency rank
- 31519
- confusion score
Side-by-Side Comparison
| Feature | io | Ions |
|---|---|---|
| Definition | A type of moth, the io moth. | A surname originating as a patronymic. |
Letter map: io vs Ions
Shared letters muted; letters that set io and Ions apart highlighted. Shared run: 2.
Grammar separator: io vs Ions
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: io is anoun and Ionsaname. On the page they differ by 2 extra letter(s) - “io” sits inside “Ions”. Our composite confusion score for this pair is 31519, derived from the frequency rank of both members and their visual similarity.
io is recorded at frequency rank #16,946, classified as anoun, pronounced /ˈaɪəʊ/. Ions is at rank #14,573, tagged as aname.
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 31519, this pair ranks #345,417 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of io vs Ions
Shared letters: io. Private to "io": -. Private to "Ions": ns.
"io" · 2 letters · shape VV · "Ions" · 4 letters · shape VVCC
Known mistypes of this pair
- Ions ← inos · ionns · ionss · iosn · oins
Frequently Asked Questions
Do "io" and "Ions" mean the same thing in a sentence?
In ordinary English text, does "io" or "Ions" show up more?
Useful next steps
Pair "io" vs "Ions" is on the table, pick a follow-up below.
- Full dictionary entry for "io" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "Ions" - compare definitions side by side with the headword page. Word entry
- This pair ranks #345,417 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "io" and "Ions" also get mixed up with nearby pairs, the highest-scored neighbour is "io vs ith". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #345,417 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.