Rumble
Part of speech: noun
Definition: A low pitched irregular noise. A street fight or brawl.
Part of speech: verb
Definition: To make a low pitched noise. To discover deceitful or underhanded behaviour. To move while making a rumbling noise. fight, brawl.
Grumble
Part of speech: verb
Definition: To make a low, growling or rumbling noise, like a hungry stomach or certain animals.To complain.To utter in a grumbling fashion.
Part of speech: noun
Definition: A low thundering, rumbling or growling soundThe sound made by a hungry stomachA complaint