A Benedictine monk, one of the Order of Saint Benedict.
friar
noun
A member of a mendicant Christian order such as the Augustinians, Carmelites (white friars), Franciscans (grey friars) or the Dominicans (black friars).
An American fish, the silverside.
How often have the words Black Monk and friar occurred in a corpus of books? (source: Google Ngram Viewer )