Which to use
“au” is an intj and “auto” is a noun - they look or sound alike but fill different roles in a sentence.
- #7,821
- “au” frequency rank
- #871
- “auto” frequency rank
- 8692
- confusion score
Side-by-Side Comparison
| Feature | au | auto |
|---|---|---|
| Definition | Indica dolor. | Vehículo de cuatro ruedas, cerrado, con asientos, propulsado por un motor de combustión o eléctrico, destinado al transporte de una a cinco personas. |
Where the eye mixes au and auto
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between au and auto
These two trip readers on the page rather than in the ear: au is [ˈaw] while auto is [ˈawt̪o]. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “au” sits inside “auto”, and the parts of speech differ too (intj vs noun), which is usually the fastest check. Our composite confusion score for this pair is 8692, derived from the frequency rank of both members and their visual similarity.
au is recorded at frequency rank #7,821, classified as anintj, pronounced [ˈaw]. auto is at rank #871, tagged as anoun, pronounced [ˈawt̪o].
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 8692, this pair ranks #304,259 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of au vs auto
Shared letters: au. Private to "au": -. Private to "auto": ot.
"au" · 2 letters · shape VV · "auto" · 4 letters · shape VVCV
Known mistypes of this pair
- auto ← atuo · auot · autto · uato
Frequently Asked Questions
Do "au" and "auto" mean the same thing in a sentence?
Which is more common, "au" or "auto"?
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 "au" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "auto" - compare definitions side by side with the headword page. Word entry
- This pair ranks #304,259 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "au" and "auto" also get mixed up with nearby pairs, the highest-scored neighbour is "atl vs au". 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 #304,259 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.