"roar" in the noun sense
1. boom, roar, roaring, thunder
a deep prolonged loud noise
2. bellow, bellowing, holla, holler, hollering, hollo, holloa, roar, roaring, yowl
a very loud utterance (like the sound of an animal
"his bellow filled the hallway"
the sound made by a lion
"roar" in the verb sense
1. roar, howl
make a loud noise, as of wind, water, or vehicles
"The wind was howling in the trees"
"The water roared down the chute"
2. thunder, roar
utter words loudly and forcefully
"`Get out of here,' he roared"
3. howl, ululate, wail, roar, yawl, yaup
emit long loud cries
"wail in self-pity"
"howl with sorrow"
act or proceed in a riotous, turbulent, or disorderly way
"desperadoes from the hills regularly roared in to take over the town"-R.A.Billington
5. bellow, roar
make a loud noise, as of animal
"The bull bellowed"
6. roar, howl
laugh unrestrainedly and heartily
Source: WordNet® (An amazing lexical database of English)
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