THESAURUS
rumbling
boom, booming, cannonading, echo, echoic, echoing, fulminating, growl, growling, grumble, grumbling, lingering, pealing, persistent, reboant, reboation, rebound, rebounding, reecho, reechoing, repercussive, resound, resounding, reverberant, reverberating, reverberation, reverberatory, roaring, rolling, rumble, sounding, thunder, thundering, thunderlike, thunderous, thundery, tonitruant, tonitruous, undamped, volleying
ROGET THESAURUS
rumbling
Roll
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.