Difference between Grumbling and Rumbling

Grumbling

Part of speech: verb

Definition: To make a low, growling or rumbling noise, like a hungry stomach or certain animals.

Part of speech: noun

Definition: Complaining. Rumbling.

Example sentence: Say to all small and great, and that often, that fully, quickly and willingly, without grumbling and contradiction, they do all your commands that are not against God.

Rumbling

Part of speech: adjective

Definition: Deep and slow sounding.

Part of speech: verb

Definition: To make a low, heavy, continuous sound.

Part of speech: noun

Definition: The sound of complaint.