bitter betch(n = noun.plant) vicia orobus - European perennial toxic vetch;
is a kind of vetch

bitter, bitter almond, bitter almond oil, bitter aloes, bitter cassava, bitter chocolate, bitter cress, bitter dock, bitter end, bitter floom, bitter hickory, bitter lemon, bitter orange, bitter orange tree, bitter pea, bitter pecan, bitter pignut, bitter pill, bitter principle, bitter salts, bitter spar