Nouns

(n)rumble, rumbling, grumble, grumblinga loud low dull continuous noise“they heard the rumbling of thunder”
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(n)grumble, grumbling, murmur, murmuring, mutter, mutteringa complaint uttered in a low and indistinct tone
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Adjectives

(s)grumbling, rumblingcontinuous full and low-pitched throbbing sound“the rumbling rolling sound of thunder”
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