Is growl a synonyms for grumble?

Yes, "growl" can be a synonym for "grumble," but it carries a slightly different connotation.

* Growl implies a deeper, more guttural sound, often associated with animals or anger.

* Grumble is a more general term for complaining in a low, unhappy voice.

Here's an example:

* "The dog growled at the stranger." (Indicates aggression or a warning)

* "He grumbled about having to work late." (Indicates annoyance but not necessarily aggression)

So, while both words convey a negative sentiment, "growl" suggests a stronger, more forceful reaction than "grumble."