# sein vs sin

> Portuguese confusable word pair

## The two words

### sein
*verb · IPA /zaɪ̯n/ · frequency rank #43,647*
ser, estar.

### sin
*pronoun · frequency rank #8,687*
aquilo, aquele

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/pt/vs/sein-vs-sin