Open English Wordnet
Nouns
(n)howl, howling, ululationa long loud emotional utterance“he gave a howl of pain”,
“howls of laughter”,
“their howling had no effect” (n)howlthe long plaintive cry of a hound or a wolf (n)howla loud sustained noise resembling the cry of a hound“the howl of the wind made him restless” Verbs
(v)roar, howlmake a loud noise, as of wind, water, or vehicles“The wind was howling in the trees”,
“The water roared down the chute” (v)roar, howllaugh unrestrainedly and heartily