Synonyms for Holler (same or very similar meaning)
WordNet sense 1 (a small valley between mountains):
hollowWordNet sense 2 (a very loud utterance (like the sound of an animal)):
bellow, roar, roaring, yowl, bellowing, holla, hollering, hollo, holloaWordNet sense 3 (shout out):
holler outWordNet sense 4 (utter a sudden loud cry):
call, cry, scream, shout, squall, yell, shout outWordNet sense 5 (complain):
beef, bellyache, crab, gripe, grouse, squawkFrom the ODE community, based on WordNetadd/edit