There are several different ways in which rabbits communicate with one another. This page goes into detail about how they talk with one another, and some sounds and pieces of body language you as an owner should look out for.
Rabbit’s have lots to talk about!
Growling. Some people will be surprised to learn that much like cats and dogs, rabbits will make a growling sound. It means the same thing as it does in larger animals, leave me alone!
Purring. This is a sign of a very content pet. Like cats, rabbits purr when then they feel happy and comfortable.
Squeaking. Rabbits squeak for several reasons. If two rabbits are close to one another, looking calm and content, a squeak can indicate that the two share a special social bond. However, if your rabbit squeaks when you pick them up or whilst fighting with other rabbits, it’s a sign that something is wrong or they are in distress. If this is the case, try and deal with the cause of distress as soon as possible.
Teeth Grinding. This is a very subtle sound that won’t be immediately obvious unless you are closely observing your rabbits. Teeth grinding means that your rabbit is either unwell or in some form of pain/discomfort. Usually both.