opp vs oz, What's the Difference?

Which to use

“opp” is a preposition and “oz” is a noun - they look or sound alike but fill different roles in a sentence.

#35,442
“opp” frequency rank: #7,037
“oz” frequency rank: 42479
confusion score

Side-by-Side Comparison

Feature	opp	oz
Definition	Abbreviation of opposite.	Abbreviation of ounce; any of various units of weight and volume.

Where the eye mixes opp and oz

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

3 ch

opp

2 ch

Look-alike desk: opp vs oz

These two trip readers on the page rather than in the ear: opp is /ɒp/ while oz is /aʊns/. 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 (preposition vs noun), which is usually the fastest check. Our composite confusion score for this pair is 42479, derived from the frequency rank of both members and their visual similarity.

opp is recorded at frequency rank #35,442, classified as aprep, pronounced /ɒp/. oz is at rank #7,037, tagged as anoun, pronounced /aʊns/.

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 42479, this pair ranks #248,831 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of opp vs oz

Shared letters: o. Private to "opp": p. Private to "oz": z.

"opp" · 3 letters · shape VCC · "oz" · 2 letters · shape VC

Frequently Asked Questions

Do "opp" and "oz" mean the same thing in a sentence?

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

Frequency check: "opp" vs "oz" - which ranks higher?

"oz" is the more common of the two: it sits at frequency rank #7,037 in our English list, against #35,442 for "opp". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

Full dictionary entry for "opp" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "oz" - compare definitions side by side with the headword page. Word entry
This pair ranks #248,831 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"opp" and "oz" also get mixed up with nearby pairs, the highest-scored neighbour is "omi vs opp". Nearby pair

Confusion rank #248,831 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.