Grunted is a word that typically conveys a low, guttural noise made by an animal or a person. However, there are several other synonyms that can be used in its place for variety. For instance, "snorted" is a great alternative for when a person quickly exhales through their nostrils in a non-verbal way. A "growl," on the other hand, is a low, menacing noise that can be made by either an animal or a person. Similarly, "snarl" is another synonym for a deep, aggressive rumble, usually made by an animal. Finally, "huff" is another appropriate synonym that describes an exhale of air, usually done in a forceful manner. By using these synonyms, writers can avoid repetition and add more visual interest to their work.