Open English Wordnet
Nouns
(n)thundera booming or crashing noise caused by air expanding along the path of a bolt of lightning Verbs
(v)thundermove fast, noisily, and heavily“The bus thundered down the road” (v)thunder, roarutter words loudly and forcefully“`Get out of here,' he roared” (v)thunder, boombe the case that thunder is being heard“Whenever it thunders, my dog crawls under the bed” (v)thunderto make or produce a loud noise“The river thundered below”,
“The engine roared as the driver pushed the car to full throttle”