# castor

> English word · Noun · IPA /ˈkɑːs.tə/ · frequency rank #22,921

## Definitions
1. A hat made from the fur of the beaver.
2. A heavy quality of broadcloth for overcoats.
3. Castoreum (bitter exudate of mature beavers).
4. Any of various nymphalid butterflies of the genus Ariadne, of Africa and Asia.

## Etymology
From Middle French castor, from Old French castor (“beaver”), from Latin castor (“beaver”), from Ancient Greek κάστωρ (kástōr), from Doric Greek κάστον (káston, “wood”).

## Easily confused with
- **Cato** (https://plainspell.com/en/vs/castor-vs-cato)
- **cater** (https://plainspell.com/en/vs/castor-vs-cater)
- **custom** (https://plainspell.com/en/vs/castor-vs-custom)
- **Castro** (https://plainspell.com/en/vs/castor-vs-castro)
- **coaster** (https://plainspell.com/en/vs/castor-vs-coaster)
- **cast** (https://plainspell.com/en/vs/cast-vs-castor)
- **caste** (https://plainspell.com/en/vs/caste-vs-castor)
- **canto** (https://plainspell.com/en/vs/canto-vs-castor)
- **castle** (https://plainspell.com/en/vs/castle-vs-castor)
- **Carter** (https://plainspell.com/en/vs/carter-vs-castor)
- **canton** (https://plainspell.com/en/vs/canton-vs-castor)
- **Casper** (https://plainspell.com/en/vs/casper-vs-castor)
- **carton** (https://plainspell.com/en/vs/carton-vs-castor)
- **cantor** (https://plainspell.com/en/vs/cantor-vs-castor)
- **caster** (https://plainspell.com/en/vs/caster-vs-castor)
- **Caspar** (https://plainspell.com/en/vs/caspar-vs-castor)
- **candor** (https://plainspell.com/en/vs/candor-vs-castor)
- **canter** (https://plainspell.com/en/vs/canter-vs-castor)
- **captor** (https://plainspell.com/en/vs/captor-vs-castor)

## Common misspellings (8)
`acstor`, `casotr`, `casstor`, `castorr`, `casttor`, `catsor`, `ccastor`, `csator`

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