# sill vs sine

> English confusable word pair

## The two words

### sill
*noun · IPA /sɪl/ · frequency rank #29,086*
A breast wall; window breast; horizontal brink which forms the base of a window.

### sine
*noun · IPA /saɪn/ · frequency rank #25,577*
In a right triangle, the ratio of the length of the side opposite an angle to the length of the hypotenuse.

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