Which to use
“perímetro” is a noun and “primeiro” is an adjective - they look or sound alike but fill different roles in a sentence.
- #8,937
- “perímetro” frequency rank
- #142
- “primeiro” frequency rank
- 9079
- confusion score
Side-by-Side Comparison
| Feature | perímetro | primeiro |
|---|---|---|
| Definition | soma dos comprimentos de todos os lados de um polígono | refere-se àquele que ocupa a posição inicial em uma série; o mais antigo; o que vem antes |
Letter map: perímetro vs primeiro
Shared letters muted; letters that set perímetro and primeiro apart highlighted. Shared run: 6. perímetro runs 9 letters (CVCVCVCCV) against primeiro's 8 (CCVCVVCV) - the length gap alone is often enough to separate them once you know to check it.
Part-of-speech tell for perímetro / primeiro
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: perímetro is anoun and primeiroanadjective. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 9079, derived from the frequency rank of both members and their visual similarity.
perímetro is recorded at frequency rank #8,937, classified as anoun. 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 9079, this pair ranks #64,476 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of perímetro vs primeiro
Shared letters: emopr. Private to "perímetro": tí. Private to "primeiro": i.
"perímetro" · 9 letters · shape CVCVCVCCV · "primeiro" · 8 letters · shape CCVCVVCV
Known mistypes of this pair
- primeiro ← pirmeiro · pprimeiro · priemiro · primeior · primeirro · primerio · primiero · primmeiro
Frequently Asked Questions
Can "perímetro" and "primeiro" be used interchangeably?
Which is more common, "perímetro" or "primeiro"?
Useful next steps
Pair "perímetro" vs "primeiro" is on the table, pick a follow-up below.
- Full dictionary entry for "perímetro" 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 #64,476 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "perímetro" and "primeiro" also get mixed up with nearby pairs, the highest-scored neighbour is "primeira vs primeiro". 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 #64,476 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.