Brethren
WordNet
noun
(1) (plural) the lay members of a male religious order
WiktionaryText
Noun
brethren
- the body of members, especially of a fraternal, religious or military order
Usage notes
The plural "brethren" is generally used for members of an organization, especially a religious body, whereas the plural "brothers" is used in the familial sense as well as for larger groups.