Which to use
“day” is a noun and “doi” is a num - they look or sound alike but fill different roles in a sentence.
- #2,512
- “day” frequency rank
- #13,272
- “doi” frequency rank
- 15784
- confusion score
Side-by-Side Comparison
| Feature | day | doi |
|---|---|---|
| Definition | dia (período de 24 horas) | dois; representado pelo algarismo hindu-arábico 2 |
Where the eye mixes day and doi
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Why the eye confuses day with doi
These two trip readers on the page rather than in the ear: day is /deɪ/ while doi is /doj/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (noun vs num), which is usually the fastest check. Our composite confusion score for this pair is 15784, derived from the frequency rank of both members and their visual similarity.
day is recorded at frequency rank #2,512, classified as anoun, pronounced /deɪ/. doi is at rank #13,272, tagged as anum, pronounced /doj/.
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 15784, this pair ranks #55,939 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of day vs doi
Shared letters: d. Private to "day": ay. Private to "doi": io.
"day" · 3 letters · shape CVV · "doi" · 3 letters · shape CVV
Frequently Asked Questions
Can "day" and "doi" be used interchangeably?
Frequency check: "day" vs "doi" - which ranks higher?
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 "day" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "doi" - compare definitions side by side with the headword page. Word entry
- This pair ranks #55,939 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "day" and "doi" also get mixed up with nearby pairs, the highest-scored neighbour is "dat vs doi". Nearby pair
Confusion rank #55,939 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.