# Dec vs DSI

> English confusable word pair

## The two words

### Dec
*name · frequency rank #4,363*
A diminutive of the male given name Declan.

### DSI
*noun · IPA /diː ɛs aɪ/ · frequency rank #47,027*
Initialism of diffused surface illumination.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/dec-vs-dsi