Which to use
“on” is a num and “only” is an adjective - they look or sound alike but fill different roles in a sentence.
- #1,908
- “on” frequency rank
- #15,434
- “only” frequency rank
- 17342
- confusion score
Side-by-Side Comparison
| Feature | on | only |
|---|---|---|
| Definition | Diez. | Único. |
Where the eye mixes on and only
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between on and only
These two trip readers on the page rather than in the ear: on is [ˈon] while only is /ˈəʊn.li/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “on” sits inside “only”, and the parts of speech differ too (num vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 17342, derived from the frequency rank of both members and their visual similarity.
on is recorded at frequency rank #1,908, classified as anum, pronounced [ˈon]. only is at rank #15,434, tagged as anadj, pronounced /ˈəʊn.li/.
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 17342, this pair ranks #272,543 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of on vs only
Shared letters: no. Private to "on": -. Private to "only": ly.
"on" · 2 letters · shape VC · "only" · 4 letters · shape VCCV
Known mistypes of this pair
- only ← noly · olny · onlly · onlyy · onnly · onyl
Frequently Asked Questions
Can "on" and "only" be used interchangeably?
In ordinary Spanish text, does "on" or "only" 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 "on" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "only" - compare definitions side by side with the headword page. Word entry
- This pair ranks #272,543 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "on" and "only" also get mixed up with nearby pairs, the highest-scored neighbour is "oli vs only". 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 #272,543 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.