Synonyms for Bellow (same or very similar meaning)
WordNet sense 1 (United States novelist (born in Canada in 1915)):
Saul BellowWordNet sense 2 (a very loud utterance (like the sound of an animal)):
holler, roar, roaring, yowl, bellowing, holla, hollering, hollo, holloaWordNet sense 3 (shout loudly and without restraint):
bawlFrom the ODE community, based on WordNetadd/edit