bull mastiff(n = noun.animal) - large powerful breed developed by crossing the bulldog and the mastiff;
is a kind of working dog

american pit bull terrier, battle of bull run, blue bull, boston bull, bull, bull bay, bull brier, bull fiddle, bull fly, bull market, bull moose, bull moose party, bull neck, bull nettle, bull nose, bull pine, bull run, bull session, bull shark, bull snake, bull terrier, bull thistle, bull through, bull tongue, bull trout, irish bull, john bull, mastiff, mastiff bat, papal bull, pit bull terrier, sitting bull, staffordshire bull terrier, take the bull by the horns, taurus the bull, tibetan mastiff