io vs IPA, What's the Difference?

Which to use

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

#16,946
“io” frequency rank: #19,373
“IPA” frequency rank: 36319
confusion score

Side-by-Side Comparison

Feature	io	IPA
Definition	A type of moth, the io moth.	Initialism of International Phonetic Alphabet.

Where the eye mixes io and IPA

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

2 ch

3 ch

IPA

Look-alike desk: io vs IPA

These two trip readers on the page rather than in the ear: io is /ˈaɪəʊ/ while IPA is /ˌaɪ.piːˈeɪ/. 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 name), which is usually the fastest check. Our composite confusion score for this pair is 36319, 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/. IPA is at rank #19,373, tagged as aname, pronounced /ˌaɪ.piːˈeɪ/.

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 36319, this pair ranks #304,149 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of io vs IPA

Shared letters: i. Private to "io": o. Private to "IPA": ap.

"io" · 2 letters · shape VV · "IPA" · 3 letters · shape VCV

Frequently Asked Questions

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

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

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

"io" is the more common of the two: it sits at frequency rank #16,946 in our English list, against #19,373 for "IPA". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

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

Full dictionary entry for "io" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "IPA" - compare definitions side by side with the headword page. Word entry
This pair ranks #304,149 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"io" and "IPA" also get mixed up with nearby pairs, the highest-scored neighbour is "Ilan vs IPA". Nearby pair

Confusion rank #304,149 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.