Which to use
“open” is an adjective and “opp” is a preposition - they look or sound alike but fill different roles in a sentence.
- #314
- “open” frequency rank
- #35,442
- “opp” frequency rank
- 35756
- confusion score
Side-by-Side Comparison
| Feature | open | opp |
|---|---|---|
| Definition | Physically unobstructed, uncovered, etc. | Abbreviation of opposite. |
Where the eye mixes open and opp
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses open with opp
These two trip readers on the page rather than in the ear: open is /ˈəʊ.pən/ while opp is /ɒp/. 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 (adjective vs preposition), which is usually the fastest check. Our composite confusion score for this pair is 35756, derived from the frequency rank of both members and their visual similarity.
open is recorded at frequency rank #314, classified as anadj, pronounced /ˈəʊ.pən/. opp is at rank #35,442, tagged as aprep, pronounced /ɒp/.
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 35756, this pair ranks #309,206 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of open vs opp
Shared letters: op. Private to "open": en. Private to "opp": -.
"open" · 4 letters · shape VCVC · "opp" · 3 letters · shape VCC
Known mistypes of this pair
- open ← oepn · openn · opne · oppen · poen
Frequently Asked Questions
Can "open" and "opp" be used interchangeably?
Which is more common, "open" or "opp"?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "open" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "opp" - compare definitions side by side with the headword page. Word entry
- This pair ranks #309,206 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "open" and "opp" also get mixed up with nearby pairs, the highest-scored neighbour is "omi vs opp". 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 #309,206 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.