# capsule vs castle

> English confusable word pair

## The two words

### capsule
*noun · IPA /ˈkæps(ə)l/ · frequency rank #11,176*
A membranous envelope.

### castle
*noun · IPA /ˈkɑːsəl/ · frequency rank #3,282*
A large residential building or compound that is fortified and contains many defences; in previous ages often inhabited by a nobleman or king. Also, a house or mansion with some of the architectural features of medieval castles.

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