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”