Which to use
“old” is an adjective and “oz” is a noun - they look or sound alike but fill different roles in a sentence.
- #174
- “old” frequency rank
- #7,037
- “oz” frequency rank
- 7211
- confusion score
Side-by-Side Comparison
| Feature | old | oz |
|---|---|---|
| Definition | Of an object, concept, relationship, etc., having existed for a relatively long period of time. | Abbreviation of ounce; any of various units of weight and volume. |
Where the eye mixes old and oz
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Why the eye confuses old with oz
These two trip readers on the page rather than in the ear: old is /ˈəʊld/ 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 (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 7211, derived from the frequency rank of both members and their visual similarity.
old is recorded at frequency rank #174, classified as anadj, pronounced /ˈəʊld/. 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 7211, this pair ranks #508,091 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of old vs oz
Shared letters: o. Private to "old": dl. Private to "oz": z.
"old" · 3 letters · shape VCC · "oz" · 2 letters · shape VC
Frequently Asked Questions
Do "old" and "oz" mean the same thing in a sentence?
In ordinary English text, does "old" or "oz" show up more?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "old" 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 #508,091 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "old" and "oz" also get mixed up with nearby pairs, the highest-scored neighbour is "omi vs oz". Nearby pair
Confusion rank #508,091 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.