Which to use
“io” is a noun and “ith” is an adjective - they look or sound alike but fill different roles in a sentence.
- #16,946
- “io” frequency rank
- #49,435
- “ith” frequency rank
- 66381
- confusion score
Side-by-Side Comparison
| Feature | io | ith |
|---|---|---|
| Definition | A type of moth, the io moth. | Occurring at position i in a sequence. |
Where the eye mixes io and ith
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence. io runs 2 letters (VV) against ith's 3 (VCC) - the length gap alone is often enough to separate them once you know to check it.
Look-alike desk: io vs ith
These two trip readers on the page rather than in the ear: io is /ˈaɪəʊ/ while ith is /aɪθ/. 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 (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 66381, 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/. ith is at rank #49,435, tagged as anadj, pronounced /aɪθ/.
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 66381, this pair ranks #68,271 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of io vs ith
Shared letters: i. Private to "io": o. Private to "ith": ht.
"io" · 2 letters · shape VV · "ith" · 3 letters · shape VCC
Frequently Asked Questions
Can "io" and "ith" be used interchangeably?
Frequency check: "io" vs "ith" - which ranks higher?
What to do next
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 "ith" - compare definitions side by side with the headword page. Word entry
- This pair ranks #68,271 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "io" and "ith" also get mixed up with nearby pairs, the highest-scored neighbour is "ISR vs ith". Nearby pair
Confusion rank #68,271 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.