rumble vs growl

rumble and growl both are nouns.

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

As verbs, rumble and growl are synonyms defined as:

Other synonyms of rumble include grumble.

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

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