rumbling(n = noun.event) grumble, grumbling, rumble - a loud low dull continuous noise; "they heard the rumbling of thunder"
is a kind of noise
Derived forms verb rumble2, verb rumble1
rumbling(s = adj.all) grumbling - continuous full and low-pitched throbbing sound; "the rumbling rolling sound of thunder"
N roll, drumming, berloque, bombination, rumbling, tattoo, drumroll, dingdong, tantara, rataplan, whirr, ratatat, ratatat-tat, rubadub, pitapat, quaver, clutter, charivari, racket, cuckoo, repetition, peal of bells, devil's tattoo, reverberation, clickety-clack, hum, purr, hummingbird, cat, kitten (animal sounds), rolling, monotonous, like a bee in a bottle.