What is another word for grunted?

Here are some words that could replace "grunted," depending on the context and the desired nuance:

General:

* Muttered

* Snorted

* Growled

* Whispered

* Said in a low voice

* Emitted

* Uttered

* Voiced

More specific:

* Coughing (if the sound is like a cough)

* Moaned (if the sound is pained or sad)

* Groaned (if the sound is of effort or displeasure)

* Hummed (if the sound is a low, continuous hum)

* Stuttered (if the sound is broken or hesitant)

Informal:

* Huffed

* Sniffed

* Pffted

* Gurgled

The best choice will depend on the specific situation and the desired level of formality.