From WordNet (r) 2.0 (August 2003) [wn]:
holler
n 1: a very loud utterance (like the sound of an animal); "his
bellow filled the hallway" [syn: bellow, bellowing,
holla, hollering, hollo, holloa, roar,
roaring, yowl]
2: a small valley between mountains; "he built himself a cabin
in a hollow high up in the Appalachians" [syn: hollow]
v 1: shout out; "He hollered out to surrender our weapons" [syn:
holler out]
2: utter a sudden loud cry; "she cried with pain when the
doctor inserted the needle"; "I yelled to her from the
window but she couldn't hear me" [syn: shout, {shout
out}, cry, call, yell, scream, hollo, squall]
3: complain; "What was he hollering about?" [syn: gripe,
grouse, crab, beef, squawk, bellyache]