Which to use
“primeira” is a noun and “primeiro” is an adjective - they look or sound alike but fill different roles in a sentence.
- #191
- “primeira” frequency rank
- #142
- “primeiro” frequency rank
- 333
- confusion score
Side-by-Side Comparison
| Feature | primeira | primeiro |
|---|---|---|
| Definition | uma das marchas do motor de um veículo | refere-se àquele que ocupa a posição inicial em uma série; o mais antigo; o que vem antes |
Where the eye mixes primeira and primeiro
Muted = shared; highlighted = the visual trap. They share 7 letters in sequence. primeira and primeiro follow the identical consonant-vowel pattern (CCVCVVCV). Same shape at a glance is often the real trap, independent of shared letters.
Visual trap between primeira and primeiro
These two trip readers on the page rather than in the ear: primeira is /pɾi.ˈmɐj.ɾɐ/ while primeiro is [pɾi.ˈmej.ɾʊ]. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - a in “primeira” becomes o in “primeiro”, and the parts of speech differ too (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 333, derived from the frequency rank of both members and their visual similarity.
primeira is recorded at frequency rank #191, classified as anoun, pronounced /pɾi.ˈmɐj.ɾɐ/. primeiro is at rank #142, tagged as anadj, pronounced [pɾi.ˈmej.ɾʊ].
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 333, this pair ranks #75,302 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of primeira vs primeiro
Shared letters: eimpr. Private to "primeira": a. Private to "primeiro": o.
"primeira" · 8 letters · shape CCVCVVCV · "primeiro" · 8 letters · shape CCVCVVCV
Known mistypes of this pair
Frequently Asked Questions
Can "primeira" and "primeiro" be used interchangeably?
Which is more common, "primeira" or "primeiro"?
After this comparison
Eye-level mix-up between "primeira" and "primeiro" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "primeira" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "primeiro" - compare definitions side by side with the headword page. Word entry
- This pair ranks #75,302 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "primeira" and "primeiro" also get mixed up with nearby pairs, the highest-scored neighbour is "palmeira vs primeira". 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 #75,302 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.