Which to use
“old” is an adjective and “on” is a num - they look or sound alike but fill different roles in a sentence.
- #11,277
- “old” frequency rank
- #1,908
- “on” frequency rank
- 13185
- confusion score
Side-by-Side Comparison
| Feature | old | on |
|---|---|---|
| Definition | Viejo, anciano. | Diez. |
Where the eye mixes old and on
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Look-alike desk: old vs on
These two trip readers on the page rather than in the ear: old is /ˈəʊld/ while on is [ˈon]. 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 num), which is usually the fastest check. Our composite confusion score for this pair is 13185, derived from the frequency rank of both members and their visual similarity.
old is recorded at frequency rank #11,277, classified as anadj, pronounced /ˈəʊld/. on is at rank #1,908, tagged as anum, pronounced [ˈon].
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 13185, this pair ranks #288,790 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of old vs on
Shared letters: o. Private to "old": dl. Private to "on": n.
"old" · 3 letters · shape VCC · "on" · 2 letters · shape VC
Frequently Asked Questions
Is swapping "old" for "on" ever safe?
Which is more common, "old" or "on"?
After this comparison
Eye-level mix-up between "old" and "on" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "old" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "on" - compare definitions side by side with the headword page. Word entry
- This pair ranks #288,790 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "old" and "on" also get mixed up with nearby pairs, the highest-scored neighbour is "old vs ome". Nearby pair
Confusion rank #288,790 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.