Which to use
“onion” is a noun and “onto” is a preposition - they look or sound alike but fill different roles in a sentence.
- #8,464
- “onion” frequency rank
- #1,768
- “onto” frequency rank
- 10232
- confusion score
Side-by-Side Comparison
| Feature | onion | onto |
|---|---|---|
| Definition | A monocotyledonous plant (Allium cepa), allied to garlic, used as vegetable and spice. | Arriving upon or on top of (speaking of a physical or metaphorical movement). |
Where the eye mixes onion and onto
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. onion runs 5 letters (VCVVC) against onto's 4 (VCCV) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses onion with onto
These two trip readers on the page rather than in the ear: onion is /ˈʌn.jən/ while onto is /ˈɒn.tuː/. 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 (noun vs preposition), which is usually the fastest check. Our composite confusion score for this pair is 10232, derived from the frequency rank of both members and their visual similarity.
onion is recorded at frequency rank #8,464, classified as anoun, pronounced /ˈʌn.jən/. onto is at rank #1,768, tagged as aprep, pronounced /ˈɒn.tuː/.
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 10232, this pair ranks #493,334 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of onion vs onto
Shared letters: no. Private to "onion": i. Private to "onto": t.
"onion" · 5 letters · shape VCVVC · "onto" · 4 letters · shape VCCV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "onion" for "onto" ever safe?
Which is more common, "onion" or "onto"?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "onion" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "onto" - compare definitions side by side with the headword page. Word entry
- This pair ranks #493,334 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "onion" and "onto" also get mixed up with nearby pairs, the highest-scored neighbour is "onion vs Oxon". 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 #493,334 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.