Synonyms for Howl (same or very similar meaning)
WordNet sense 1 (a long loud emotional utterance):
howling, ululationWordNet sense 2 (cry loudly, as of animals):
yammer, yowl, wrawlWordNet sense 3 (emit long loud cries):
roar, ululate, wail, yawl, yaupFrom the ODE community, based on WordNetadd/edit