growl vs rumble

growl and rumble both are nouns.

Word	Noun	Adjective	Verb	Adverb
growl	Yes	No	Yes	No
rumble	Yes	No	Yes	No

As verbs, growl and rumble are synonyms defined as:

Other synonyms of growl include grumble.

growl (noun)	rumble (noun)
the sound of growling (as made by animals)	a fight between rival gangs of adolescents
	a servant's seat (or luggage compartment) in the rear of a carriage
	a loud low dull continuous noise

growl (verb)	rumble (verb)
to utter or emit low dull rumbling sounds	to utter or emit low dull rumbling sounds
	make a low noise