Black-friar
BLACK-FRIAR, noun Black-friars is a name given to the Dominican Order, called also Predicants and preaching friars; in France, Jacobins.
BLACK'-GUARD, noun [said to be of black and guard; but is it not a corruption of black-ard, black-king?]
A vulgar term applied to a mean fellow, who uses abusive, scurrilous language, or treats others with foul abuse.