"growl" in the noun sense
1. growl, growling
the sound of growling (as made by animals)
"growl" in the verb sense
1. grumble, growl, rumble
to utter or emit low dull rumbling sounds
"he grumbled a rude response"
"Stones grumbled down the cliff"
Source: WordNet® (An amazing lexical database of English)
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