COWAN
Cowan is the term for a non-witch. That is to say for a person who has not been initiated into the craft is a Cowan.
In fact the word is an old Scottish term for a mason who has learnt the trade but not served an apprenticeship.
A Cowan may be invited to attend sabbats but are usually not allowed to attend circles or esbats.
A Witches' Bible: The Complete Witches Handbook
WITCHCRAFT
PARALUMUN