Which to use
“iso” is a noun and “issa” is a contraction - they look or sound alike but fill different roles in a sentence.
- #9,771
- “iso” frequency rank
- #21,249
- “issa” frequency rank
- 31020
- confusion score
Side-by-Side Comparison
| Feature | iso | issa |
|---|---|---|
| Definition | Clipping of isolation. | Contraction of it's + a. |
Where the eye mixes iso and issa
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between iso and issa
These two trip readers on the page rather than in the ear: iso is /ˈaɪsəʊ/ while issa is /ˈɪsə/. 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 contraction), which is usually the fastest check. Our composite confusion score for this pair is 31020, derived from the frequency rank of both members and their visual similarity.
iso is recorded at frequency rank #9,771, classified as anoun, pronounced /ˈaɪsəʊ/. issa is at rank #21,249, tagged as acontraction, pronounced /ˈɪsə/.
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 31020, this pair ranks #349,724 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of iso vs issa
Shared letters: is. Private to "iso": o. Private to "issa": a.
"iso" · 3 letters · shape VCV · "issa" · 4 letters · shape VCCV
Known mistypes of this pair
- issa ← isas · sisa
Frequently Asked Questions
Do "iso" and "issa" mean the same thing in a sentence?
Which is more common, "iso" or "issa"?
What to do next
Eye-level mix-up between "iso" and "issa" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "iso" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "issa" - compare definitions side by side with the headword page. Word entry
- This pair ranks #349,724 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "iso" and "issa" also get mixed up with nearby pairs, the highest-scored neighbour is "ISR vs issa". 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 #349,724 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.